Japan weather in September
Japan in September averages 21°C (71°F), 156 mm of rain and 4.9 hours of sun a day. It is one of the wetter months of the year here.
Of the twelve months in Japan, September is the third warmest, the wettest and the dullest.
- Average temp
- 21°C (71°F)
17–26°C · 62–79°F
- Rainfall
- 156 mm
A wet month
- Sunshine
- 4.9 h
hours per day
What is Japan like in September?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Expect frequent rain — this is a wet month.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Japan in September?
A proper waterproof, not a folding umbrella
156 mm in the month usually arrives as heavy bursts that an umbrella will not cover.
A dry bag for phone and documents
Worth it for one downpour caught between the taxi and the door.
A layer for the evening
Evenings cool off noticeably once the sun is down.
September compared with August and October
September in Japan is 4.8°C cooler than August and 58 mm wetter than it, which averages 26°C (79°F).
September in Japan is 7°C warmer than October and 29 mm wetter than it, which averages 14°C (58°F).
Daylight in Japan in September
On 15 September the sun is up for 12 hours 25 minutes in Japan, rising about 05:29 and setting about 17:54 local time.
September ends 1 hour 5 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 2 hours 12 minutes short of June, the longest-lit month here.
Japan weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 0°C / 32°F | 45 mm |
| February | 1°C / 34°F | 35 mm |
| March | 5°C / 41°F | 83 mm |
| April | 11°C / 52°F | 78 mm |
| May | 17°C / 63°F | 92 mm |
| June | 21°C / 70°F | 114 mm |
| July | 25°C / 76°F | 130 mm |
| August | 26°C / 79°F | 98 mm |
| September | 21°C / 71°F | 156 mm |
| October | 14°C / 58°F | 128 mm |
| November | 8°C / 47°F | 56 mm |
| December | 3°C / 37°F | 32 mm |
Similar weather in September
Other destinations whose September averages sit close to this one.
Check another month
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FAQs about Japan in September
September climate averages for Japan, 1991–2020.
Japan averages 21°C (71°F) in September, ranging from about 17°C (62°F) at night to 26°C (79°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Yes, a lot. September brings about 156 mm, which makes it one of the wetter months here — expect heavy bursts rather than all-day drizzle.
Yes. September averages 21°C (71°F) against 14°C (58°F) in October — 7°C warmer.
September is 4.8°C cooler than August, and 58 mm wetter.
Yes. September falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 4.9 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 25 minutes of daylight in mid-September, against 14 hours 37 minutes in June and 9 hours 43 minutes in December.
On 15 September, sunrise is about 05:29 and sunset about 17:54 local time. Both shift across the month — the month ends 1 hour 5 minutes shorter than it starts.
