Japan in September: where is it warmest?
In September, Naha, Okinawa is the warmest place with 29 °C by day, Sapporo the coolest with 21 °C. 30 of 33 destinations have good holiday weather.
All destinations in September, warmest first
Long-term averages for the month: daytime high, sea, sunshine and rainy days.
| Place | Score | Air | Sea | Sun | Rain days |
|---|---|---|---|---|---|
| Naha, Okinawa | 74 | 29° | 29° | 6 h | 15 |
| Kagoshima | 55 | 29° | 28° | 6 h | 15 |
| Okinawa | 74 | 28° | 29° | 6 h | 15 |
| Nara | 69 | 28° | – | 5 h | 11 |
| Kumamoto | 68 | 28° | 27° | 5 h | 11 |
| Osaka | 66 | 28° | – | 5 h | 12 |
| Okayama | 72 | 27° | 27° | 5 h | 11 |
| Kyoto | 71 | 27° | – | 5 h | 11 |
| Nagasaki | 71 | 27° | 27° | 6 h | 13 |
| Kobe | 71 | 27° | 26° | 6 h | 12 |
| Kitakyūshū | 70 | 27° | 26° | 5 h | 12 |
| Fukuoka | 68 | 27° | 26° | 6 h | 14 |
| Nagoya | 67 | 27° | – | 5 h | 13 |
| Chiba | 63 | 27° | 25° | 5 h | 14 |
| Hamamatsu | 60 | 27° | 26° | 5 h | 16 |
| Itsukushima | 78 | 26° | 26° | 6 h | 11 |
| Hiroshima | 73 | 26° | 26° | 6 h | 11 |
| Kanazawa | 66 | 26° | 26° | 5 h | 14 |
| Tokyo | 64 | 26° | 25° | 4 h | 14 |
| Yokohama | 64 | 26° | 25° | 4 h | 13 |
| Minato | 64 | 26° | 25° | 4 h | 13 |
| Kawasaki | 64 | 26° | 25° | 4 h | 13 |
| Yokosuka | 64 | 26° | 26° | 4 h | 13 |
| Shizuoka | 60 | 26° | 26° | 5 h | 16 |
| Niigata | 65 | 25° | 26° | 5 h | 14 |
| Kamakura | 64 | 25° | 26° | 4 h | 13 |
| Nagano | 58 | 25° | – | 5 h | 18 |
| Sendai | 62 | 24° | – | 4 h | 15 |
| Matsumoto | 61 | 24° | – | 5 h | 16 |
| Aomori | 72 | 23° | 23° | 5 h | 12 |
| Hakone | 55 | 23° | – | 4 h | 17 |
| Hakodate | 70 | 22° | 23° | 5 h | 12 |
| Sapporo | 69 | 21° | – | 5 h | 13 |
Japan in September: quick answers
Japan in September: where is it warmest?
The warmest places in September are Naha, Okinawa (29 °C), Kagoshima (29 °C) and Okinawa (28 °C).
Japan in September: where is the sea warmest?
The sea is warmest at Naha, Okinawa (29 °C), Okinawa (29 °C) and Kagoshima (28 °C).
Japan in September: where is the weather best?
The best holiday weather in September – warm, sunny and dry – is in Itsukushima, Naha, Okinawa and Okinawa.
Japan month by month
Japan: weather & best time to visit
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences