Summary of weather and temperature (May 4th to May 10th, 2025) Low pressure passes; places with extremely heavy rain in Kyushu

2025/05/15 21:21

A summary of the weather and temperatures from May 4th to May 10th, 2025.

[About the weather during this period]
# Characteristics of the atmospheric pressure layout
On the 4th, a low pressure system with a front proceeded northeasterly towards Hokuriku and off the coast of Sanin. Another low pressure system travels northeasterly through the Sea of Japan. On the 5th, a low pressure system accompanied by a front line flew northeasterly down the east of the Kuril Island. It traveled through the South China and the Southwest Islands to the south of Japan. The center of high pressure moved eastward around Honshu. On the 6th, a low pressure system accompanied by a front moved south of Honshu. A front extending from the low pressure system passed through Okinawa. On the 7th, a low pressure system accompanied by a front moved northeasterly in the Kanto region. The front extending from the low pressure system passed through the east of Japan to the southern seas, and south of Okinawa to southern China. On the 8th, a low pressure system advanced northeasterly across Japan's East Sea and moved away from near Japan. The front has moved from the low pressure system to Japan's Tokai and South China. Around 3pm, a low pressure system appeared on the front near Hua Zhong, and headed eastward into the East China Sea. On the 9th, a cyclone accompanied by a front developed, moving northeasterly through the East China Sea. At night we headed to the Korean Peninsula. A warm front extending from the low pressure system passes through western Japan. On the 10th, a low pressure system moved northeasterly through the Sea of Japan. The front above the cyclone was blocked, and the front extended from eastern Japan to the South China Sea.

#Precture
On the 4th, rain began mainly on the Sea of Japan side and Hokuriku in the morning, due to the effects of low pressures that traveled through the Sea of Japan and the front line. On the 5th, when rain and thunderstorms were locally occurring in northern Japan and Kanto in the afternoon, rain gradually fell in the southern Kyushu to the Nansei Islands due to the influence of the front, causing heavy rain. On the 6th, rain began to rain over a wide area, mainly on the Pacific side of the west and eastern Japan, due to the eastward movement of the low pressure system. Very heavy rain was observed on Kumejima, Okinawa Prefecture, where the front passed. A heavy rain warning has been issued. On the 7th, as the low pressure system progressed northeasterly, the rain clouds gradually moved from eastern to north Japan. Heavy rain was observed in Nagano and Tohoku. On the 8th, the area around Honshu was covered by a wide high pressure system, and there was no precipitation in most areas. In the Ogasawara Islands and Okinawa, rain temporarily began due to the influence of the front line. On the 9th, the low pressure system developed and we proceeded to the Korean Peninsula. The front passes through western Japan. Rain clouds developed in Kyushu, and extremely heavy 62.0mm rain fell in Fukue, Goto City, Nagasaki Prefecture. On the 10th, there was a wide rain due to low pressure and front lines. Rain in the Nansei Islands. In the Nansei Islands, there were places where extremely heavy rain was observed on Ishigaki Island and other places.


#Temperature
On the 4th, sunlight reached the Pacific side of the west to the eastern Japan, and warm air poured into the sky, making it a summer day of over 25 C. On the 5th, it was covered in mobile high pressure and sunny in the west and eastern Japan. Temperatures rose in western Japan and Kanto, and many of them were summer days. On the 6th, the sky was dominated by clouds nationwide due to the effects of a low pressure system. The highest temperature in Tokyo was 18.1 C, as observed at 4:29, and the temperature did not rise during the day and the 2pm temperature was 14.2 C. On the 7th, the weather was sunny in the East to Western Japan, mainly on the Pacific side, but the north winds were outstanding and the temperature didn't rise much. The highest temperature in Tokyo was 23.0c, as observed at 14:32. On the 8th, the area around Honshu was covered in high pressure, and it was sunny all over the country, with summer days exceeding 25 C in parts of western Japan. On the 9th, the East and Western Japan were dominated by clouds due to the effects of low pressure and fronts. Many areas are lower than normal, especially in western Japan. On the 10th, the weather recovered and temperatures rose in western Japan and Hokuriku. In particular, in Hokuriku, the temperature rose due to the influence of the Fohn phenomenon associated with the south wind, and in Toyama, a midsummer day of 30.4 C was observed.



#Summary of weather for this period (May 4th to May 10th)
Average temperatures were high in northern Japan, covered in warm air, and in Abashiri it was 2.5c warmer than normal. Meanwhile, there are many cloudy and rainy days from Tohoku to Kyushu, and the temperature does not rise. Many of the areas were as low as normal or slightly lower than normal.
Precipitation was higher than usual from Tohoku to Okinawa due to the effects of low pressure and fronts. In Kyushu, heavy rain was observed, with extremely heavy rain, resulting in heavy rain, which fell about twice as much as normal. On the other hand, there was little rain in Hokkaido, with much less than normal, mainly on the Sea of Okhotsk side.
Due to the influence of humid air, the sky was slightly dominant in clouds from northern Japan to eastern Japan, and in many places it was as low as normal or slightly less. On the other hand, many western Japan were on par with normal years. The Nansei Islands were cloudy due to the influence of the front line, and were much smaller than normal.

Warning-level heavy rain will likely be on the weekend; "high temperatures and heavy rain" trends in the next month. Will the rainy season begin early this year [Weekly to 1 month forecast]

2025/05/15 15:43

Today, the 15th (Thursday), the 15th, is covered in high pressure, and many areas are sunny.

Due to the warm air above and the influence of the Fohn phenomenon, there are some northern Japan, such as Aomori and Iwate, which have midsummer days of over 30 C.

Tomorrow, the 16th (Friday), moist air from the high pressure margins will flow, and the front will extend from the continent to western Japan.

The weather is downhill from the west tomorrow, and rain is expected to start from the west in the afternoon
/Rain is expected to start from the west such as Kyushu and Shikoku.



The front will stagnate near Honshu from the 17th (Sat) to the 18th (Sunday), and in Western Japan, heavy rain and extremely heavy rain could fall, leading to heavy rain at the level of the
warning.



This year, the rainy season in Okinawa and Amami regions is delayed from normal, but before the rainy season begins, we will need to be careful and be careful about the rain around Honshu this weekend.


It would be a good idea to clean the gutters and other parts before it starts to rain

It would be a good idea to improve the drainage.




The front will likely stagnate near Honshu all the way through next week, and the weather is expected to continue cloudy and rainy.


Depending on the movement of the front line and the low pressure system on the front line
/Rain and wind may intensify, so please continue to be aware of the latest information.



If we look at the temperature in the weekly weather, it is expected that the temperature will continue to remain high in the future.

We expect the humidity to increase gradually through next week, and
We expect to see more hot days like the rainy season.

We are not yet used to the heat, so please be careful of heat stroke, such as drinking water frequently.




Let's take a look at the points in the
1 month forecast (May 17th to June 16th) announced by the Japan Meteorological Agency today (Thursday), Thursday the 15th.

#Temperature#
It is likely to be covered in warm air nationwide, and the temperature is high, and in particular, the
temperature is expected to be quite high from Saturday the 17th to Friday the 23rd.

#Precency#
Because it is susceptible to fronts and humid air, it is more common on the Pacific side of Eastern Japan to Western Japan, and more common on the Sea of Japan side of Eastern and Western Japan.
In Okinawa and Amami, there are times when it is less likely to be affected by fronts and humid air, so
Precision for the next month is expected to be as low as normal or as low.

#Sunlight hours#
It is expected to be as low as normal or less on the Pacific side of East Japan to Western Japan, and
It is expected to be on the Sea of Japan side of East Japan to Western Japan.
In Okinawa and Amami, it is probably as common or as usual.



The rainy season in the area around Honshu is still a while away, but
Since it will be cloudy and rainy for a while from this weekend,
/Basically, the rainy season may begin earlier than usual this year.

In preparation for the heavy rainy season,
It would be a good idea to start reviewing disaster prevention goods and more now.

Signs of the end of the "Great Kuroshio Means", the longest recorded history, for seven years and nine months [Summary of the Oceans, May 4th to 10th, 2025]

2025/05/15 12:03

Since August 2017, the Kuroshio Current has been a massive meandering flowing from the Kii Peninsula off the coast of Tokai, and its duration is until mid-April 2025, and has been around for about 7 years and 9 months.

After that, part of the Kuroshio Current was cut off off the coast of Tokai and flowed roughly east off Shio Cape, and as of May 8th, no large meandering was seen.
There are signs that this condition will continue in the future and the Kuroshio snake will end.


The Japan Meteorological Agency is calling for caution, "Please note that the Kuroshio flow paths affect vessel operations, fish species and fishing locations, and the marine environment along the coast."


Below is a summary of the oceans, May 4th to 10th, 2025.



#Pressure arrangement and waves
On the 4th, a cyclone with a front passed through Honshu and headed off the coast of Sanriku.
Wave heights around 3m off Sanriku and eastern Hokkaido.

On the 5th, a cyclone with another front began to move east from the continent.
They continued to develop along the southern coast of Honshu on the 6th.
On the evening of the 6th, the wave height was around 3m from the south of Japan to the east of Kanto.

On the 7th, the low pressure system further developed and moved northeast off the coast of Sanriku.
At night, the wave height exceeded 4m in the east of Japan and it was over 4m.
On the 8th, the area around Honshu was covered by high pressure, and the waves became milder.

On the 9th, a low pressure system accompanied by a front traveled through the Korean Peninsula from the East China Sea.
Wave height 3m in the East China Sea.
On the 10th, the low pressure system advanced to the Sea of Japan.
The south winds toward the low pressure system strengthened, and waves reached over 4m in the waters near the Izu Islands.



#Sea surface temperature
The sea surface temperature in the Japanese Sea is slightly higher than normal on the northern and central continental side, and
The other parts continue to be in the same or slightly lower seas than normal.


The East China Sea has expanded slightly lower than normal waters.


There are signs that the Kuroshio Current's giant meandering, which has been going on for seven years and nine months, will end in this period, and the Pacific side is beginning to return to normal or slightly lower sea surface temperatures.


The off Sanriku area was lower than normal, with a maximum temperature of 3 C lower.
On the other hand, the temperature was higher than normal offshore off the coast of Hokkaido and around the Sea of Okhotsk, and the temperature was up to around 3 C on the coast of the Sea of Okhotsk.

The weather will be downhill from the west tomorrow, the 16th (Friday); during weekends off, be careful of heavy rain on the west and eastern Japan Pacific side.

2025/05/15 08:04

The high pressure system will move away from Japan's East Sea, and tomorrow, the 16th (Friday), the front will approach the area near Honshu, with the weather set to falling downhill from the west. As warm, humid air from the south flows towards the front, very active rain clouds are expected to form near the front.


The weather will be disrupted in Kyushu tomorrow, the 16th (Friday). The rain is expected to spread to the Chugoku and Shikoku regions late at night.
From the weekends on the 17th (Sat) and 18th (Sun) the rain will spread mainly on the Pacific side of western Japan and eastern Japan. The rain area is likely to spread to northern Japan on Sunday the 18th. Since heavy rain can occur locally with lightning, you need to be careful of low-reaching land, flooding rivers, and flooding roads.


There is currently a lot of uncertainty about predicting the timing of rain to intensify and the position of the front line, but if you plan to go out on weekends off, be sure to check the latest weather information the next day.




Since then, the front is expected to stagnate near Honshu through the middle of next week, so it is likely that the weather will continue to be cloudy and rainy over a wide area.

Recorded the first summer day of the year in Sapporo, tomorrow, the 15th (Thursday) is the heat coming up in the west and eastern Japan.

2025/05/14 20:50

Today, the 14th (Wednesday), the area around Honshu was covered in high pressure, and there were many sunny spots. Warm air above 12 C was flowing in around 1500m above, and the highest temperature in many regions of northern Japan to western Japan was 25 C or higher.


We observed a temperature of 30.4 C on Shimojijima, Miyakojima City, Okinawa Prefecture, and it was a midsummer day of 30 C or higher. In Honshu, temperatures were similar to those in the early and mid-July, with temperatures approaching mid-summer day, with many areas approaching mid-summer day, with temperatures of 29.8c, Fukuchiyama City, Kyoto Prefecture, 29.6c, Dazaifu City, Fukuoka Prefecture, 29.5c, Minohe Town, Aomori Prefecture, and 29.4c, and Maizuru City, Kyoto Prefecture.


In major cities, we observed 25.9 C in Sapporo, and observed the first summer day of the year, as well as summer days above 25 C in central Tokyo and Osaka.

#Maximum temperature in major cities
*Sapporo 25.9c (Late July)
Sendai 23.3c (Mid June)
Tokyo 26.3c (Mid June)
Nagoya 26.6c (Early June)
Osaka 27.2c (Early June)
Fukuoka 27.5c (Mid June)
Naha 27.9c (Late May)
*: Updated the highest temperature this year




Tomorrow, the 15th (Thursday), the area around Honshu will continue to be covered by high pressure, and many areas will be able to reach the sun. In Sapporo, the expected maximum temperature for the 15th is 25 C, and is expected to be another summer day. It is a vast summer day from western Japan to eastern Japan, and some places will approach midsummer day at a temperature of 30 degrees Celsius or higher inland. Make sure to drink plenty of hydration to avoid heat stroke.

Frontline stagnation: The rainy season begins in Honshu The weekend is afraid of heavy rain, and the heat is hot and humid

2025/05/14 13:10

From now on, the heat ahead of the seasons is approaching some places.
From the sluggish heat to the gradually steaming heat.
In the second half of the week, the front line stagnated near Honshu.
It is expected that the rainy season will continue in Honshu, as if the rainy season has begun before Okinawa.
There is a risk of heavy rain on the Pacific Ocean from the west to the Pacific Ocean on the weekends.



#Is it a rare sunny day today, Wednesday the 14th to tomorrow, Thursday the 15th
Today, Wednesday the 14th, it is covered in high pressure and is sunny.
In the afternoon, due to the cold air above, humid air inflows and rising daytime temperatures, there will likely be showers and thunderstorms in Tokai, Kanto, Koshin, and Tohoku. Others don't have to worry about rain.
Although clouds will likely spread tomorrow, the 15th (Thursday), it is expected to be covered in high pressure and many areas are reachable.

#Later of the week The rainy season continues in Honshu There is a risk of heavy rain over the weekend
However, tomorrow, the 16th (Friday), the front will extend from the continent to western Japan.
In western Japan, rain gradually begins to fall, and there are likely some areas with lightning strikes and gusts of wind.
And then, towards the first half of next week, the front line will stagnate from the near Honshu to the southern shore of Honshu. In Honshu, the weather will continue to look like the rainy season has begun before Okinawa.
Specially on weekends, the front will stagnate near Honshu, and heavy rain will occur on the west to the Pacific Ocean, due to the effects of the warm, humid air heading towards the front.
The average rainy season near Honshu is often early June, but if there is still a rainy season to begin, please be careful and take measures against heavy rain as soon as possible.





#From the tanned heat to the gradually steaming heat
There will be many days when the maximum temperature is above 25c. It is likely that some places are in the midsummer day, with a maximum temperature of 30 C or higher, especially in the inland areas of Kanto, Koshin.
On sunny days covered in high pressure, the heat will be tingly hot, but as the front rises, the heat will gradually turn into a steamy heat.
Be careful of heat stroke.

Today and tomorrow is a precious sunny day, and from now on, the sky looks like the rainy season

2025/05/14 10:32

Today, the 14th (Wednesday), will be covered in high pressure, and the weather will be sunny from Okinawa to Tohoku.
However, it seems that there will be cloudy times in the mornings in Tokai and Hokuriku.
In addition, in Kanto, Koshin, there are areas along the mountains in the afternoon, with showers and thunderstorms expected.
There are some sunny spots in Hokkaido, but there are probably many clouds, mainly in the eastern part.

/The high pressure will be covered in high pressure tomorrow, the 15th (Thursday), but the sky is more likely to show clouds than today.

, but today and tomorrow's sunny days will be precious.




The front will move north from Friday the 16th, and
It is expected to stagnate near the southern shore of Honshu through the first half of next week.
For this reason, there are many days where rain is prone to rain, especially in western and eastern Japan.
Also, due to the influence of the valley of atmospheric pressure passing in northern Japan, it is likely that the weather will be cloudy and unresolved with rain.


The weather mark on the weekly forecast is followed by a mark that makes you think that the rainy season has begun.


I want to use today and tomorrow's sunny days in a meaningful way.
Please note that the average yearly prices for the start of the rainy season are as follows.

#Normal values for the rainy season
Okinawa: around May 10th
Amami: around May 12th
Night Kyushu: around May 30th
Now in Kyushu: around June 4th
Shikoku: around June 5th
Chugoku: around June 6th
Kinki: around June 6th
Tokai: around June 6th
Kanto: around June 7th
Hokuriku: around June 11th
South Tohoku: around June 12th
Now north Tohoku: around June 15th

It is widely used in summer days, mainly in the west and eastern Japan, and in some places it is midsummer day at temperatures above 30 C!

2025/05/14 08:08

A low pressure system is located to the east of the Kuril Island, which moves away from the east, and a stagnant front extends east to west over Japan's southern seas.
On the other hand, there is a high pressure system on the Tokai region of Japan, spreading around Honshu.

Currently, there are many clouds and rainy areas in Hokkaido, but it is sunny over a wide area from Tohoku to Okinawa.




Today, the weather will be covered in high pressure, and the weather will be sunny from Okinawa to Tohoku.
However, it seems that there will be cloudy times in the mornings in Tokai and Hokuriku.
In addition, in Kanto, Koshin, there are areas along the mountains in the afternoon, with showers and thunderstorms expected.
There are some sunny spots in Hokkaido, but there are probably many clouds, mainly in the eastern part.



Temperatures rise during the day, with the weather warming from late May to early July.
In the west and eastern Japan, there are many summer days with temperatures above 25 C, and inland, there are some midsummer days with temperatures above 30 C.



The temperature difference between the nighttime and is likely to increase.
Please be careful about your physical condition and agricultural crop management.

Will Honshu begin the rainy season first than Okinawa Rain continues in the area around Honshu from the second half of the week (weekly weather)

2025/05/13 12:41

#Weekly weather points for the upcoming weather#
+The seasonal heat is ahead of the charts up until the 15th (Thursday); there may be a possibility of midsummer day
+Fri on the 16th (Friday); the front line may stagnate near Honshu; heavy rain may occur on the Pacific side
+Is Okinawa's "rainy season" starting from next week onwards


Today, the 13th (Tuesday), the area around Honshu is covered in high pressure and is clear.

Temperatures have risen, with the highest temperature until noon in Tottori, such as 27.3c, and in some places in Western Japan, summer days are from the morning to the morning and above 25c.

Well, the weather will be sunny for a few days and the "pre-season heat" will continue, but from the second half of the week, the front will likely stagnate near Honshu, and the weather is expected to continue as if the "rainy season" was first introduced in the
Honshu, except for Okinawa.




Until around Thursday the 15th, the area will be within high pressure, and there will be many sunny spots around Honshu.
The temperature rises to around 30c, and it is likely that some places will be in midsummer days above 30c.

However, on Friday the 16th, it appears that moist air will enter the rear of the high pressure system and from the south, the source of rain clouds, will flow in.

On the 16th (Friday), the weather will be downhill from the west, and rain is expected to start falling in Kyushu and other places at night.

On Saturday the 17th, the front extends from the continent to the area near Honshu, and then the front will likely stagnate through the first half of next week.


From the weekend, the pressure system is expected to continue as if the rainy season has begun in the area around Honshu.


#Originally, it is currently the time when Okinawa and Amami are beginning to begin#

The rainy season begins in the Okinawa region around May 10th and the Amami region around May 12th, but this year, the rainy season has not yet begun in Okinawa or Amami.

So, why does Okinawa not enter the rainy season, and will the weather continue to look like the
rainy season has begun in the area around Honshu in the future



This is because the "summer Pacific High Pressure" is getting stronger faster than usual.

The Pacific High Pressure in the summer will rapidly increase its strength starting this week, and the front, which originally stagnant near Okinawa, will be pushed up to the area around Honshu, causing rain to continue near Honshu.

For this reason, the weather around Honshu will suddenly become like the "real rainy season" from the weekend, so there is a risk of heavy rain falling, mainly in the Pacific side of the west and eastern Japan.



I think some places have fallen leaves and other leaves accumulated in the drains, making it difficult for rainwater to flow.


In preparation for heavy rain from the weekend, it's a relief to clean the gutters by the 15th (Thursday) and prepare for the rain.



In Okinawa and the Amami region
From next week on the 20th (Tuesday), the front will likely be stagnant, and there will be more rainy days.


The rainy season in Okinawa and Amami is likely to begin from next week.

The temperature rises mainly in western Japan and eastern Japan. Beware of heat stroke

2025/05/13 07:43

Today, the 13th, the area around Japan will be covered by high pressure, and the sun will be exposed to the country. As warm air flows into the sky, the temperatures are often higher than the previous day, and summer days are expected in various places, mainly in western Japan to eastern Japan.


The estimated maximum temperature will be 21c in Sapporo and 23c in Sendai, making it as warm as June. It looks like it will be warm ahead of the season.
In addition, when moving to 28 C in Nagoya, 26 C in Osaka, and 25 C in Fukuoka and Kochi, there are many places that are sure to get sweaty and cheerful. It looks like you can spend the daytime wearing short sleeves.
We expect to see a 25 C in central Tokyo, with the forecast of 25 C, which is expected to be our first summer day in two days.


This is a time when your body is not used to the heat, so when you are active outdoors, be sure to take measures against heat stroke, such as hydrating and replenishing your salt.
Also, the temperature difference between the mornings and evenings and the daytime will be large, so please be careful not to get sick.

#Expected maximum temperatures in various regions (relevant season)
+Sapporo: 21c (as in early June)
+Sendai: 23c (as in mid June)
+Tokyo: 25c (as in normal)
+Niigata: 23c (as in normal)
+Nagoya: 28c (as in late June)
+Osaka: 26c (as in normal)
+Kochi: 25c (as in normal)
+Fukuoka: 25c (as in normal)