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Kusatsu Weather by Month
Average temperatures, rainfall and humidity for Kusatsu, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Kusatsu month looks like before you travel — then check the live Kusatsu forecast for the days ahead.
Warmest month
August
33°C average high
Coolest month
February
1°C average low
Wettest month
June
174 mm of rain
Driest month
January
47 mm of rain
Average temperature and rainfall in Kusatsu 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 | 1°C | -10°C / 16°C | 47 mm | 74% | 9 km/h |
| February | 9°C | 1°C | -12°C / 21°C | 111 mm | 72% | 9 km/h |
| March | 14°C | 4°C | -7°C / 26°C | 125 mm | 70% | 9 km/h |
| April | 19°C | 9°C | -5°C / 29°C | 155 mm | 69% | 9 km/h |
| May | 24°C | 14°C | 2°C / 33°C | 112 mm | 70% | 8 km/h |
| June | 27°C | 19°C | 7°C / 44°C | 174 mm | 75% | 8 km/h |
| July | 31°C | 24°C | 14°C / 39°C | 158 mm | 77% | 7 km/h |
| August | 33°C | 25°C | 15°C / 45°C | 128 mm | 74% | 8 km/h |
| September | 29°C | 21°C | 8°C / 39°C | 116 mm | 76% | 8 km/h |
| October | 23°C | 14°C | 0°C / 34°C | 108 mm | 75% | 8 km/h |
| November | 17°C | 8°C | -5°C / 26°C | 62 mm | 74% | 8 km/h |
| December | 12°C | 3°C | -8°C / 24°C | 54 mm | 73% | 10 km/h |
Best time to visit Kusatsu
The most comfortable time to visit Kusatsu is generally May and October to November, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 1,350 mm a year.
Travellers who prefer heat should aim for August, when highs average 33°C. June is the month to avoid if rain would spoil your plans — it averages 174 mm, roughly 4× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Kusatsu forecast for what is happening now.