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Kōfu Weather by Month
Average temperatures, rainfall and humidity for Kōfu, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Kōfu month looks like before you travel — then check the live Kōfu forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
January
-3°C average low
Wettest month
July
227 mm of rain
Driest month
January
32 mm of rain
Average temperature and rainfall in Kōfu by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 9°C | -3°C | -18°C / 17°C | 32 mm | 63% | 5 km/h |
| February | 10°C | -2°C | -16°C / 25°C | 93 mm | 65% | 5 km/h |
| March | 14°C | 2°C | -14°C / 27°C | 178 mm | 67% | 5 km/h |
| April | 19°C | 8°C | -7°C / 31°C | 223 mm | 67% | 6 km/h |
| May | 24°C | 13°C | -1°C / 34°C | 117 mm | 66% | 5 km/h |
| June | 27°C | 17°C | 5°C / 39°C | 200 mm | 74% | 5 km/h |
| July | 31°C | 22°C | 12°C / 41°C | 227 mm | 77% | 5 km/h |
| August | 32°C | 23°C | 14°C / 41°C | 154 mm | 74% | 5 km/h |
| September | 28°C | 19°C | 2°C / 38°C | 157 mm | 76% | 5 km/h |
| October | 21°C | 12°C | -3°C / 32°C | 140 mm | 77% | 5 km/h |
| November | 16°C | 6°C | -8°C / 26°C | 68 mm | 75% | 5 km/h |
| December | 11°C | 0°C | -14°C / 21°C | 40 mm | 66% | 5 km/h |
Best time to visit Kōfu
The most comfortable time to visit Kōfu is generally May and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around July, totalling about 1,628 mm a year.
Travellers who prefer heat should aim for August, when highs average 32°C. July is the month to avoid if rain would spoil your plans — it averages 227 mm, roughly 7× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Kōfu forecast for what is happening now.