How long will it be hot in September in 2025? What will the average temperature be? When will it start to get cooler?
July and August 2025 (Reiwa 7) were hot.
"
how long will the heat last
There should be a lot of people who are worried about it.
So this time Expected temperature in September and average temperature in an average year I'd like to introduce_______
Kanagawa ・ Chiba Such Kanto But cool in September I will tell you too!
table of contents
- 1 Will it be hot in September 2025?
- 2 Average temperature in September
- 3 Where is the coolest place in Kanto in September?
- 4 Recommended areas with fewer extremely hot days!
- 5 The heat will continue in September 2025, but there will be some cool places!
- 6 Editorial department recommended feature articles
Will it be hot in September 2025?
| Northern Japan | eastern Japan | Western Japan | Okinawa/Amami | |
|---|---|---|---|---|
|
September Average temperature forecast |
Low 10 Average 20 High 70% high prospects |
Low 10 Average 20 High 70% high prospects |
Low 10 Average 20 High 70% high prospects |
Low 10 Average 20 High 70% high prospects |
| Appearance probability | Commentary |
|---|---|
| High (many) probability is 50% or more | high (high) chance |
| (20:40:40) | Expected to be on average or high (large) |
| More than 50% chance of normal year | Expected to be normal |
| (40:30:30) (30:40:30) (30:30:40) | Expected to be about normal |
| (40:40:20) | Expected to be average or low (low) |
| Low (small) probability is 50% or more | low (low) chance |
Forecast temperatures for September (until mid-September) announced by the Japan Meteorological Agency I will explain.
area is Northern Japan ( Hokkaido ・ Tohoku ) , Eastern Japan ( Kanto ・ Koushinetsu ・ Hokuriku ・ Tokai ) , West Japan ( Kinki ・ China ・ Shikoku ・ Kyushu ) , Okinawa ・ Amami divided into
According to the Japan Meteorological Agency, Temperatures in September are high in northern Japan, eastern Japan, western Japan, Okinawa, and Amami. is expected to .
Three-month forecasts beyond September 2025: Atmospheric and oceanic forecasts
- Due to the effects of global warming, the temperature of the entire atmosphere will be high, especially in the mid-latitudes.
- Sea surface temperatures will be low in the central equatorial Pacific Ocean, but high from the eastern Indian Ocean to the waters east of the Philippines.
- As a result, cumulonimbus clouds will occur more frequently from the eastern Indian Ocean to the seas east of the Philippines, but less frequently in the central tropical Pacific.
- Due to these influences, the westerly winds in the upper atmosphere will tend to flow more northerly than normal, and the high pressure in the upper atmosphere will be stronger in the north than normal. The Pacific high pressure will be strong, especially southeast of Japan.
- In addition, high sea surface temperatures in the mid-latitudes of the North Pacific will contribute to the tendency of westerly winds to flow northward in this region.
- For these reasons, the seasons will progress slowly and warm air will likely cover the entire country. There will be periods when Okinawa, Amami, and the Pacific side of eastern and western Japan will be susceptible to the influence of low pressure systems, fronts, and humid air.
weather term
The westerlies are the constant winds that blow from west to east throughout the year in mid-latitude regions (approximately 30 to 60 degrees in the Northern and Southern Hemispheres). They are caused by the Coriolis force due to the Earth's rotation and the difference in air pressure between the high-temperature, low-pressure zone near the equator and the cold, high-pressure zone at high latitudes. They can sometimes intensify as the jet stream, significantly affecting climate and weather changes and aircraft flight times. It plays an important role in weather patterns, especially in temperate regions, including Japan.
Average temperature in September
Many people are probably wondering about the average temperature in September. I wonder when it will get cooler.
So below, 2021 (Reiwa 3), 2022 (Reiwa 4), 2023 (Reiwa 5), 2024 (Reiwa 6) based on the data of Taking Tokyo as an example, the average temperature in September (day/maximum/minimum) Let's look at.
| year and month | Average daily temperature (Tokyo) | Maximum temperature of the day (Tokyo) | Minimum temperature of the day (Tokyo) |
|---|---|---|---|
| September 2021 | 22.3°C | 26.2°C | 19.3℃ |
| September 2022 | 24.4℃ | 28.8℃ | 21.1°C |
| September 2023 | 26.7℃ | 31.2℃ | 23.6℃ |
| September 2024 | 26.6℃ | 30.9℃ | 23.5℃ |
The highest average daily temperature will be in September 2023 (Reiwa 5).
26.7℃
.
The highest daily maximum temperature will be recorded in September 2023 (Reiwa 5).
31.2℃
is.
The lowest temperature in September 2023
23.6℃
The result was that it was the highest.
Considering the average and maximum temperature of the day, The temperature is rising every year It can be said.
Where is the coolest place in Kanto in September?
Knowing that the hot days will continue in September,
i want to go to a cool place
There should be many people who think.
So next
Cool place in Kanto
I'd like to introduce!
Midsummer day: A day with a maximum temperature of 30°C or higher
Extremely hot day: A day with a maximum temperature of 35°C or higher
Kanto is a city by the sea, Chiba ・ Katsuura City or Choshi City , Kanagawa ・ Miura City pick up.
Let's compare summer days, midsummer days, and scorching hot days in September 2024 (Reiwa 6)!
Choshi/Chiba
| September 2024 |
summer day (25°C or higher) |
midsummer day (30°C or higher) |
Extremely hot day (35°C or higher) |
|---|---|---|---|
| Tokyo | 9th | 18th | 1 day |
| Choshi | 9th | 16th | 0 days |
Chiba
・
Choshi City
teeth
Located at the easternmost point of the Kanto Plain
death,
About 100km from Tokyo
in a remote location.
If you take the Boso Limited Express "Shiosai" from JR Tokyo Station, it will take about 1 hour and 50 minutes.
.
2 to 2.5 hours by car
Arrive at
Surrounded by the sea, Choshi City is a rare city in the Kanto Plain. It has a maritime climate with cool summers and warm winters. .
September 2024 (Reiwa 6),
Summer days in Tokyo on the 9th
.
Midsummer Day is the 18th
.
One extremely hot day
.
Even though it's September
Tokyo
There were 18 days with midsummer temperatures (over 30°C), which is quite a lot.
on the other hand,
Choshi City's summer day is the 9th
.
Midsummer Day is the 16th
. No hot days.
Choshi City has the same number of summer days as Tokyo, but two fewer midsummer days.
is.
The reason why Choshi City is cool is because of the Kuroshio Current. . The Kuroshio Current flows off the coast of Choshi, and the water surface temperature is around 25°C even in summer. It is said to be cool because the sea breeze from the south blows in and cools it down.
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Katsuura/Chiba
| September 2024 |
summer day (25°C or higher) |
midsummer day (30°C or higher) |
Extremely hot day (35°C or higher) |
|---|---|---|---|
| Tokyo | 9th | 18th | 1 day |
| Katsuura | 14th | 15th | 0 days |
Chiba
・
Katsuura City
teeth
Located in the southeastern part of Chiba
death,
About 75km from the city center
Located far away.
Like Choshi City,
Oceanic climate with cool summers and warm winters
is.
According to data from September 2024 (Reiwa 6),
Katsuura City's summer day is the 14th, and midsummer day is the 15th
There are five more summer days in Katsuura than in Tokyo, but three fewer midsummer days. There are no extremely hot days.
Compared to Tokyo,
Although the maximum temperature does not rise as high as midsummer days, there are many summer days and the temperature difference is small.
It can be said.
Katsuura City
from
Choshi City
It takes about two to two and a half hours by car.
However, Katsuura City's midsummer day
Tokyo
for the same reason as Choshi
The Kuroshio Current
is influencing
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Miura/Kanagawa
| September 2024 |
summer day (25°C or higher) |
midsummer day (30°C or higher) |
Extremely hot day (35°C or higher) |
|---|---|---|---|
| Tokyo | 9th | 18th | 1 day |
| Miura | The 10th | 19th | 0 days |
Kanagawa
・
Miura City
is located at the southernmost tip of the Miura Peninsula
.
A location surrounded by the sea on three sides, with Tokyo Bay to the east, the Pacific Ocean to the south, and Sagami Bay to the west.
is.
Distance to Tokyo is about 75km . It takes about an hour and a half by train from JR Tokyo Station to Keikyu Miura Kaigan Station. By car it takes about an hour.
Because Miura City is surrounded by the sea on three sides, warm in winter, cool in summer climate .
According to data from September 2024 (Reiwa 6),
In Miura, the summer day is on the 10th, and the midsummer day is on the 19th
is.
Miura City has one more summer day than Tokyo, and one more midsummer day.
. No hot days.
Recommended Feature Articles
The hottest place in Kanto in September is Miura, Kanagawa!
|
midsummer day descending order |
Miura (19th) > Tokyo (18th) > Choshi (16th) > Katsuura (15th) |
|---|---|
|
the summer day descending order |
Katsuura (14th) > Miura (10th) > Choshi (9th) = Tokyo (9th) |
" The heat will continue into September, so I want to go somewhere that feels like summer. If you are thinking this, why not visit Miura City in Kanagawa?
Kanagawa
・
Miura City and surrounding areas
So
SUP experience
or
diving
,
BBQ
is popular.
Be sure to try it out when you visit!
[Kanagawa, Miura Beach] Anyone can do a walk on the sea right away! SUP experience
This plan allows you to experience the marine sport "SUP (Stand Up Paddle Board)," which has been gaining popularity in recent years. The duration is approximately 2 hours (experience time is approximately 1.5 hours). The experience time may be shortened depending on the changes in sea conditions. The fee includes a full SUP rental set, a life jacket, and beginner's lecture fee. When the sea conditions are good,
[Kanagawa, Miura City] Beginners welcome - Koajiro Bay SUP tour (2.0 hours)
[Free photo data provided!] A small-group SUP tour around the bay, round trip to Koajiro Forest at the very back of Koajiro Bay. This tour is in a bay that is less affected by wind and waves, so even first-time SUPers can participate with confidence. Stylish beach houses with piers are dotted among the lush, beautiful nature. There is a classical yacht harbor and a secret base from the Pacific War.
[Free pick-up from Shibuya] "No experience necessary! 2 Beach Fun Diving"
Enjoy two beaches for casual fun. Additional dives are also available. This is a fun diving plan for customers who have obtained a certification. There is no need to worry about seasickness because it is a beach entry. Recommended for customers who have obtained a license but have little experience in diving. Gain experience and confidence with the support of an instructor. *If you do not have equipment,
If you're not a fan of diving but want to take a peek underwater, this is a must-see! You'll practice the skills necessary for snorkeling in shallow waters before heading out to sea! Our instructors, who are well versed in the ocean, will provide you with full support to ensure you have fun safely. The minimum age to participate is 10 years old, and anyone who is healthy can participate, so it's perfect for families, couples, and groups.
[Kanagawa, Miura Beach] Have fun casually! Empty-handed beach BBQ
We provide rental of all BBQ equipment and ingredients according to the number of people. This plan allows you to enjoy BBQ on the beach for a whole day (10:00-17:00). Everything is provided, so you can come empty-handed. Applications can be made for 4 to 100 people. Enjoy a casual BBQ with family and friends, or hold a BBQ party at a work event! Since the equipment is rented,
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Recommended areas with fewer extremely hot days!
From here Areas outside of Kanto with fewer days of extreme heat I'd like to introduce_______
Minamiizu/Shizuoka
| September 2024 |
summer day (25°C or higher) |
midsummer day (30°C or higher) |
Extremely hot day (35°C or higher) |
|---|---|---|---|
| Tokyo | 9th | 18th | 1 day |
| Southern Izu (Irozaki) | 12th | 15th | 0 days |
Shizuoka ・ Minamiizu Town teeth Located at the southernmost tip of the Izu Peninsula death, Approximately 3 hours from Tokyo by express train such as Odoriko Arrive at
In fact, since 1939 when statistics began to be collected in Minamiizu Town, A place that hasn't recorded a heatwave in 86 years The highest temperature ever recorded was on July 20, 2004. 33.9 degrees It is as follows.
Also, if we look at the average temperatures from July to September 2024,
July: 27°C, August: 28.3°C, September: 26.5°C
The average temperature does not reach 30 degrees.
The reason why it is cool even in midsummer is
The strong sea breeze and the cold seawater deep in the surrounding area are some of the reasons for this.
.
In the Minamiizu area of Shizuoka Snorkeling at Hirizo Beach It is only available for a limited time from early July to late September each year, so be sure to visit during this period!
At the southern tip of Shizuoka Prefecture, in Minamiizu, there is Hirizo Beach, a beach on the border between Irozaki and Nakagi. It is a popular spot known as "Izu's last unexplored area" and cannot be reached by foot. The outstanding transparency and abundance of fish make it unrivaled as a snorkeling spot, even in the Kanto region and the Izu Peninsula! The only way to get to Hirizo Beach is by taking the ferry from Nakagi.
★This is a special early bird discount plan available only for last minute reservations! At the southern tip of Shizuoka Prefecture, in Minami Izu, is Hirizo Beach, a coastline on the border between Irozaki and Nakagi. It is a popular spot known as "Izu's last unexplored area" and cannot be reached on foot. Its outstanding transparency and abundance of fish make it unrivaled as a snorkeling spot, even in the Kanto region or on the Izu Peninsula! Hirizo Beach
[Minamiizu, Hirizo Beach] Snorkeling and boat tour
Minamiizu Hirizo Beach! This snorkeling spot at the tip of the Izu Peninsula can only be reached by boat. Snorkeling can be enjoyed by anyone from first grade elementary school students to adults, and an instructor will accompany you, so you can enjoy it with peace of mind. Said to be the last unexplored area, it is open for a limited time until the end of September, and the density of fish and clarity are astonishing. *8am Shimoda City, Minamiizu Town, Shimoda Station, Parking
[Shizuoka/Minamiizu] Hirizo Beach Snorkeling Experience
This is the "Minamiizu Nakagi/Hirizo Beach Snorkeling Experience Tour" at the southernmost tip of Shizuoka Prefecture. Hirizo Beach has become increasingly popular as a snorkeling spot in recent years, boasting crystal clear water that rivals that of Okinawa in Japan. At Hirizo Beach, which can only be reached by boat, a diving instructor will teach you how to use the equipment, basic snorkeling techniques, and underwater swimming.
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Naha/Okinawa
| September 2024 |
summer day (25°C or higher) |
midsummer day (30°C or higher) |
Extremely hot day (35°C or higher) |
|---|---|---|---|
| Tokyo | 9th | 18th | 1 day |
| Naha | 3 days | 18th | 0 days |
It may be surprising, but Okinawa is a place where there are few extremely hot days. .
According to data from September 2024,
Okinawa
On a midsummer day
Tokyo
Although it is more
There are no extremely hot days
.
Also, July and August 2024 will be
Tokyo recorded a total of 19 days of extremely hot weather, while Okinawa recorded only 8 days.
It is as follows.
The reasons why Okinawa has few extremely hot days are as follows: Less affected by sea breezes, föhn phenomenon, and heat island effect Some examples include:
Okinawa in September
continues to
Playing in the sea
or
Marine sports
You can enjoy it to the fullest!
Compared to the high season in July and August, there are fewer tourists so it's easier to book activities, making this a recommended time.
☆COVID-19 Countermeasure Store☆Okinawa Blue Cave Beach Experience Diving★Please take a look at our five-star reviews♪ We treasure the messages we have received from many customers! We are proud of it!! Photos and videos taken underwater will be transferred to your smartphone immediately after the dive! It is said that the latest GoPro footage already exceeds the capabilities of the human eye.
★★If you come to Miyakojima, you must visit "Yuni no Hama"★★ It's going viral on TikTok as "The Best Beach in Heaven"!! If you come to Miyakojima, this is a place you definitely want to visit! The famous Uni no Hama tour★ This performance is only possible because the captain and guide are from Miyakojima! It's a popular photo spot for influencers and models, and is also a popular spot for music videos! Create wonderful memories in Miyakojima
Opened in 2020! Featuring a rainbow parachute and a cute clownfish-colored parachute! A brand new boat made in the USA! A one-of-a-kind, fully custom-made boat filled with the captain's attention to detail. Why not take a stroll through the beautiful sky and sea of Ishigaki Island on the clownfish-colored NOA boat with a parachute that's sure to look great on Instagram? (Depending on the wind and the straits of the day,
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The heat will continue in September 2025, but there will be some cool places!
It looks like the heat will continue into September 2025 (Reiwa 7).
but Tokyo A few hours away from cool place There is also
"It's hot even in September", "I want to go to a cool place!" Kanagawa ・ Miura City , Chiba ・ Katsuura City ・ Choshi City Other than that, in northern Kanto Ibaraki , Tochigi , Gunma Also recommended you know!
*The content of this article is current as of August 2025.
