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Jōetsu Weather by Month
Average temperatures, rainfall and humidity for Jōetsu, Japan, month by month, built from OpenWeather's historical records. Use it to see what a typical Jōetsu month looks like before you travel — then check the live Jōetsu forecast for the days ahead.
Warmest month
August
31°C average high
Coolest month
February
1°C average low
Wettest month
December
143 mm of rain
Driest month
February
86 mm of rain
Average temperature and rainfall in Jōetsu 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 | 6°C | 1°C | -10°C / 16°C | 102 mm | 90% | 20 km/h |
| February | 6°C | 1°C | -10°C / 18°C | 86 mm | 87% | 18 km/h |
| March | 10°C | 4°C | -5°C / 25°C | 125 mm | 82% | 15 km/h |
| April | 15°C | 8°C | -2°C / 26°C | 131 mm | 78% | 12 km/h |
| May | 21°C | 13°C | 1°C / 31°C | 95 mm | 79% | 10 km/h |
| June | 24°C | 18°C | 6°C / 34°C | 103 mm | 86% | 9 km/h |
| July | 29°C | 23°C | 17°C / 39°C | 139 mm | 88% | 9 km/h |
| August | 31°C | 23°C | 16°C / 39°C | 116 mm | 86% | 10 km/h |
| September | 27°C | 20°C | 10°C / 37°C | 121 mm | 87% | 11 km/h |
| October | 20°C | 14°C | 3°C / 33°C | 108 mm | 88% | 13 km/h |
| November | 14°C | 9°C | -2°C / 27°C | 115 mm | 87% | 15 km/h |
| December | 9°C | 4°C | -6°C / 19°C | 143 mm | 89% | 19 km/h |
Best time to visit Jōetsu
The most comfortable time to visit Jōetsu is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around December, totalling about 1383 mm a year.
Travellers who prefer heat should aim for August, when highs average 31°C. December is the month to avoid if rain would spoil your plans — it averages 143 mm, roughly 2× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Jōetsu forecast for what is happening now.