Weather in Japan in September
September in Japan is mild enough that walking is the default. This is a city-break month more than a sea-holiday month.
A country pin in September is a warning: one region of Japan will not match another. Use a city page if you already know where you are going. Compared with August and January, September sits in the middle of Japan's year.
- Average temp
- 21°C
17–26°C
- Rainfall
- 156 mm
A wet month
- Sunshine
- 4.9 h
hours per day
What to expect
Daytime
Mild afternoons in Japan are the prize in September. You can eat outside on the good days. You still want something for the breeze.
This is walking weather. Shade is useful, not essential the way it is in the hot months. A long outdoor day is a reasonable plan.
Rain
September is the wet side of the year in Japan, the wettest stretch on these averages. Days can be heavy. Plans that cannot survive rain are the wrong plans.
This is not a reason to skip Japan if you like the place. It is a reason to pack for weather and to stop treating every grey hour as a failed holiday.
Evening
Evenings are cooler. A layer helps after sunset.
What to pack
Rain jacket
A layer for cooler evenings
Where to stay in Japan
Featured stays on trip1. Dates are a starting point for September.
Average weather in Japan
TemperatureRainfall
Similar weather in September
Other destinations whose September averages sit close to this one.
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FAQs about Japan
Climate averages for Japan, 1991–2020.
The best time to visit Japan is between May and October, the most comfortable stretch of the year on these averages.
August is the hottest month, with an average around 26°C.
September is the wettest month, with about 156 mm of rain.
No. These are 1991–2020 climate normals from Meteostat, not a live forecast. Actual weather in any given week can differ.
