How long will it be hot in September 2023 & what is the average temperature? When will it get cooler?

How long will it be hot in September 2023 & what is the average temperature? When will it get cooler?
Date updated:
Activity Japan Editorial Department

Hot days continued in July and August 2023 (Reiwa 5).
" 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_______

Chiba Kanagawa Such Kanto But cool in September I will tell you too!

Will it be hot in September 2023?

Expected average temperature in September 2023
Reference: Japan Meteorological Agency "Three Month Forecast"
  Northern Japan eastern Japan Western Japan Okinawa/Amami
of September
Average temperature forecast
Low 20 Normal 30 High 50%
high prospects
Low 20 Normal 30 High 50%
high prospects
Low 20 Normal 30 High 50%
high prospects
Low 20 Normal 30 High 50%
high prospects
Explanation of probabilistic forecast
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 forecast beyond September 2023: Atmospheric and oceanic forecasts

  • Due to global warming and the El Niño phenomenon*, the temperature of the entire atmosphere is high worldwide. (especially high in tropical and subtropical regions)
  • During the first half of the period when the positive Indian Ocean Dipole mode* occurs and the effect of the La Niña*, which ended in winter, remains, cumulonimbus clouds occur frequently from the east of the Philippines to the western equatorial Pacific.
  • Therefore, in the first half of the period, the Pacific anticyclone is strong in the southeast of Japan.
  • Due to the El Niño phenomenon, westerly winds will flow slightly southerly than normal around Japan & will be stronger than normal mainly in the first half of the period
  • From the above, It is easy to be covered with warm air nationwide
    In the first half of the period, the Pacific side of eastern and western Japan and Okinawa/Amami are likely to be affected by fronts in addition to warm and moist air.

weather term

* El Niño phenomenon

The sea surface temperature in the tropical western Pacific has decreased, and the area where cumulonimbus clouds are active has shifted to the east. Because the Pacific high overhanging near Japan also shifts to the east, In summer, the extension of the Pacific high to the vicinity of Japan weakens, the temperature tends to be low, and the sunshine hours tend to be short. there is. In winter, the atmospheric pressure distribution of high to the west and low to the east weakens, and the temperature tends to rise. there is.

*Positive Indian Ocean Dipole mode phenomenon

It is a phenomenon in which the sea surface temperature in the southeastern tropical Indian Ocean is lower than normal from summer to autumn (June to November), and the activity of cumulonimbus clouds above it is less active than normal.

* La Niña phenomenon

The sea surface temperature of the western tropical Pacific Ocean will rise, and cumulonimbus activity will increase in the waters near the Philippines and Indonesia. For this reason, near Japan In summer, the Pacific high tends to extend north, and the temperature tends to rise. there is. In winter, the atmospheric pressure distribution of high west and low east becomes stronger, and the temperature tends to be low. there is.

Average temperature in September

september calendar

Many people are probably wondering about the average temperature in September. I wonder when it will get cooler.

So below, 2020 (Reiwa 2), 2021 (Reiwa 3), 2022 (Reiwa 4) based on the data of Taking Tokyo as an example, the average temperature in September (day/maximum/minimum) Let's look at.


Reference: Japan Meteorological Agency "Monthly Values" (2020-2022)
year and month Average daily temperature (Tokyo) Maximum temperature of the day (Tokyo) Minimum temperature of the day (Tokyo)
September 2020 24.2℃ 28.1°C 21.5℃
September 2021 22.3°C 26.2°C 19.3℃
September 2022 24.4℃ 28.8℃ 21.1°C

The highest average daily temperature is September 2022 24.4℃ .
The highest temperature of the day is also in September 2022 (Reiwa 4) 28.8℃ is.
The lowest temperature of the day is 2021 (Reiwa 3) September 19.3℃ is the lowest.

Considering the average and maximum temperature of the day, Temperatures are on the rise in three years from 2020 It can be said.

Where is the coolest place in Kanto in September?

Chiba Katsuura City, Ubara Utopia

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!

Summer days: days when the maximum temperature is 25°C or higher
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 extremely hot days in September 2022!

Related article

Choshi/Chiba


Reference: Japan Meteorological Agency "Tokyo (Tokyo) September 2022 (Daily Values)"
"Choshi (Chiba Prefecture) September 2022 (Daily Value)"
September 2022 summer day
(25°C or higher)
midsummer day
(30°C or higher)
Extremely hot day
(35°C or higher)
Tokyo 16th 12th 0 days
Choshi The 10th 5 days 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 2022 (Reiwa 4), Summer day in Tokyo is the 16th . midsummer day is the 12th . No hot days.
Even though it's September Tokyo There are 16 summer days (over 25°C), which is quite a lot.

on the other hand, Summer day in Choshi city is 10th . Midsummer day is 5 days . Like Tokyo, Choshi City does not have extremely hot days.
Choshi City had 6 fewer summer days and 7 days fewer midsummer days than Tokyo. It seems that.

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.

Katsuura/Chiba


Reference: Japan Meteorological Agency "Tokyo (Tokyo) September 2022 (Daily Values)"
"Katsuura (Chiba Prefecture) September 2022 (Daily Value)"
September 2022 summer day
(25°C or higher)
midsummer day
(30°C or higher)
Extremely hot day
(35°C or higher)
Tokyo 16th 12th 0 days
Katsuura 19th The 8th 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 2022, Katsuura City has 3 more summer days and 4 less midsummer days than Tokyo. is. No 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


Reference: Japan Meteorological Agency "Tokyo (Tokyo) September 2022 (Daily Values)"
"Miura (Kanagawa Prefecture) September 2022 (daily values)"
September 2022 summer day
(25°C or higher)
midsummer day
(30°C or higher)
Extremely hot day
(35°C or higher)
Tokyo 16th 12th 0 days
Miura The 10th The 10th 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 2022, Miura City's summer days and midsummer days are both 10 days apart. is not it.
Miura City has 6 days less summer days than Tokyo and 2 days less midsummer days is. No hot days.

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Choshi, Chiba is the coolest place in Kanto in September!

Inubozaki, Choshi City, Chiba Prefecture
Midsummer day & summer day comparison (Tokyo, Choshi, Katsuura, Miura)
midsummer day
descending order
Tokyo (12th) > Miura (10th) >
Katsuura (8th) > Choshi (5th)
the summer day
descending order
Katsuura (19th) > Tokyo (16th) >
Choshi = Miura (10th)

The data is only for September 2022 (Reiwa 4), Choshi City has the fewest summer and midsummer days was!

recently in the media Katsuura City is often referred to as "the coolest town in Kanto", Choshi City is recommended for those who are looking for a little-known spot!

" The heat will continue in September, so I want to go to a cool place people who think Choshi City How about going to

Around Choshi City SUP experience or BBQ , Herb/flower picking experience is popular. When you go to play, be sure to experience it!

[Chiba/ Choshi] Superb view! Experience "SUP Cruising" while looking at Byobugaura, a popular location

Kanaloa yoga
Choshi and Sawara
5,500 Yen~ (tax included)

SUP is an abbreviation for stand up paddle board. Enjoy cruising on a large, buoyant board while enjoying the beautiful scenery of Byobugaura! Before entering the sea, I will give a solid lecture on the sandy beach. Since we will teach you slowly and carefully from the beginning, we will match the group with people who are new to SUP, children, families, couples, and friends.

[Chiba/ Choshi] Pick jasmine flowers from early summer to early winter and make a fragrant bouquet!

~ Herb Garden by the Sea ~ Herb Garden Pocket
Choshi and Sawara
500 Yen~ (tax included)

A jasmine field that is very rare in Japan appears! Why don't you make a fragrant bouquet by picking jasmine flowers that bloom from summer to early winter? Comes with a special container and water jelly so you can take it home and decorate it in your room! ~ Flow of the day ~ ① Reception and explanation (5 minutes) ② Moving ~ Picking (15 minutes) ③ Wrapping (5 minutes)

[Chiba/Kujukuri/BBQ] Empty-handed OK! Meat and seafood mix 3 hour course

Beach station & Cafe gin-ger
Choshi and Sawara
3,980 Yen~ (tax included)

You can enjoy BBQ without bringing anything, regardless of the weather. You can enjoy fresh ingredients from Kujukuri. There is no need to arrange troublesome ingredients, purchase and prepare tools, charcoal raising, cleanup, etc.! *The photo is for 10 people. Comes with yakisoba and vegetables.

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September 2023 looks hot but there are cool places!

cool shade

It looks like the heat will continue in September in 2023 (Reiwa 5).

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!" Choshi City Katsuura City Miura City It is also recommended to go to you know!

*The information in this article is current as of August 2023.

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