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Isesaki Weather by Month
Average temperatures, rainfall and humidity for Isesaki, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Isesaki month looks like before you travel — then check the live Isesaki forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
February
-1°C average low
Wettest month
June
147 mm of rain
Driest month
January
10 mm of rain
Average temperature and rainfall in Isesaki 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 | 8°C | -1°C | -16°C / 18°C | 10 mm | 58% | 10 km/h |
| February | 9°C | -1°C | -18°C / 24°C | 38 mm | 57% | 10 km/h |
| March | 13°C | 3°C | -14°C / 27°C | 84 mm | 62% | 10 km/h |
| April | 18°C | 8°C | -4°C / 31°C | 119 mm | 64% | 10 km/h |
| May | 23°C | 13°C | -2°C / 35°C | 81 mm | 66% | 8 km/h |
| June | 26°C | 18°C | 5°C / 41°C | 147 mm | 75% | 7 km/h |
| July | 30°C | 22°C | 15°C / 40°C | 144 mm | 75% | 7 km/h |
| August | 32°C | 23°C | 12°C / 41°C | 121 mm | 75% | 7 km/h |
| September | 28°C | 20°C | 6°C / 38°C | 129 mm | 76% | 7 km/h |
| October | 20°C | 12°C | -5°C / 32°C | 114 mm | 74% | 8 km/h |
| November | 15°C | 6°C | -7°C / 27°C | 34 mm | 68% | 8 km/h |
| December | 11°C | 1°C | -12°C / 23°C | 16 mm | 61% | 9 km/h |
Best time to visit Isesaki
The most comfortable time to visit Isesaki is generally May to June and October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 1,036 mm a year.
Travellers who prefer heat should aim for August, when highs average 32°C. June is the month to avoid if rain would spoil your plans — it averages 147 mm, roughly 15× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Isesaki forecast for what is happening now.
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