Climate averages 1991–2020
Kofu weather
in September.
A warm, very wet month: the 3rd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Kofu: daytime highs average 25.7°C and nights cool to about 18.2°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 185 mm of rain on roughly 15 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Kai (6 km away). In September its highs average 25.3°C, about as warm as Kofu, with 185 mm of rain.
Among the 303 cities listed in Japan, Kofu ranks joint 182nd of 303 for the warmest September highs and joint 135th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Kofu is level with that mean.
From September to October, average highs fall by 5.4°C to 20.3°C, and monthly rainfall rises from 185 mm to 186 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Kofu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.5°C-2.4°C | -2.4°C | 65 | 6.8 | 10.010 h |
| February | 7.4°C-2.2°C | -2.2°C | 73 | 8.1 | 10.911 h |
| March | 11.5°C1.4°C | 1.4°C | 125 | 12.8 | 11.912 h |
| April | 17.9°C7.0°C | 7.0°C | 120 | 12.6 | 13.113 h |
| May | 22.6°C12.4°C | 12.4°C | 129 | 12.8 | 14.014 h |
| June | 25.3°C16.9°C | 16.9°C | 177 | 16.3 | 14.515 h |
| July | 28.8°C20.9°C | 20.9°C | 199 | 17.4 | 14.314 h |
| August | 29.5°C21.8°C | 21.8°C | 139 | 16.8 | 13.514 h |
| September, selected | 25.7°C18.2°C | 18.2°C | 185 | 14.6 | 12.412 h |
| October | 20.3°C12.2°C | 12.2°C | 186 | 13.0 | 11.311 h |
| November | 15.2°C6.3°C | 6.3°C | 85 | 9.2 | 10.310 h |
| December | 9.6°C1.4°C | 1.4°C | 60 | 7.4 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Kai in SeptemberJapan · 6 kmHigh 25.3°C · Low 17.8°C · 185 mm rain
- Minami-Alps in SeptemberJapan · 11 kmHigh 25.3°C · Low 17.9°C · 270 mm rain
- Fujinomiya in SeptemberJapan · 50 kmHigh 25.6°C · Low 19.6°C · 337 mm rain
- Gotemba in SeptemberJapan · 52 kmHigh 24.6°C · Low 18.5°C · 263 mm rain
- Fuji, Japan in SeptemberJapan · 57 kmHigh 26.5°C · Low 20.7°C · 279 mm rain
- Akiruno in SeptemberJapan · 60 kmHigh 25.3°C · Low 19.0°C · 249 mm rain
- Saku in SeptemberJapan · 62 kmHigh 23.7°C · Low 16.4°C · 187 mm rain
- Sagamihara in SeptemberJapan · 62 kmHigh 25.0°C · Low 18.9°C · 229 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Kofu) is explained once on the Kofu year overview and on the Sources, method and limits page.
Kai lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.