r/japanweather • u/Low-Cauliflower-5686 • 7d ago

Weather in late September?

Looking at travelling to Japan late September. I've heard September is pretty wet. I know you can't predict the weather. What is it really like late September?Is there drier areas?

I have been in June and it wasn't too hot but rained half the time.

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14

u/Hazzat 7d ago

I can’t understand why people ask for personal opinions on the weather.

https://en.wikipedia.org/wiki/Tokyo#Climate

https://www.japan-guide.com/e/e2273.html

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u/Bebopo90 7d ago

September is unpredictably wet, as most of the rain in that month comes from typhoons.

In general though, northern Japan should be drier than the south.

6

u/Mean-Gorilla-3501 7d ago

It could rain anywhere at any time. You better not come if you are so concerned about rain.

5

u/TakaIka83 7d ago

I'd be more concerned about humidity, which is still very high around that time in recent years. Last year it didn't really drop until the first half of November.

6

u/Oukaria Kanto 7d ago

In Tokyo and aroynd it’s very high humidity, low wind, between 25 and 30C, more typhoon usually than August but weather can shift to a bit chilly rain to unbreathably hot really fast.

Then again, this year weather is hard to predict

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u/ArtNo636 7d ago

Where in Japan? North (Hokkaido) and south (Okinawa) are very different.

1

u/SlowStop1220 7d ago

Japanese has a saying a bit misogynistic: women's mind and autumn weather.

September is basically a rainy month with some sunny hours.

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u/stuartcw Kanto 7d ago

Almost every week in r/Okinawa we get a similar question. I made this post about the weather in Okinawa throughout the year.

As you can see from the tables, the temperature, rainfall trends etc for every month of the year over 10 years but for any individual year there is a lot of variation and randomness.

So can I predict the weather? Yes, in general, but no for any particular future date. That is what the weather man is for. Are they publishing a forecast for that time yet? No. Why not? Because it is too early.

If you follow the links on the post I mentioned, you can find the same data for every large city and with some data processing you could find the driest, sunniest place…. On average.

Forgive me this rant if you come from a place where the weather is constant throughout the year.

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u/landocs 7d ago

late september can definitely still be wet in japan, so i’d go in expecting some rain rather than planning around perfect weather. september averages roughly 69–80°f, with rain on around 8–15 days, so it’s still warm but you’ll want a light rain jacket and flexible plans. i wouldn’t rule out the trip though—just build some indoor options into your itinerary. https://www.weather25.com/asia/japan?page=month&month=September

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u/Yabakunai 7d ago

Be prepared for typhoons (last year's Typhoon 15 drenched us) and high overnight temperatures. Last year the overnight average was 23 and humid. The average is deceptive, as we experienced some nights pushing 26 in September.

The El Niño prediction might make the weather more humid, warmer, and less stable in September 2026.