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Shirayamamachi Weather by Month
Average temperatures, rainfall and humidity for Shirayamamachi, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Shirayamamachi month looks like before you travel — then check the live Shirayamamachi forecast for the days ahead.
Warmest month
August
31°C average high
Coolest month
January
2°C average low
Wettest month
December
110 mm of rain
Driest month
February
69 mm of rain
Average temperature and rainfall in Shirayamamachi 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 | 7°C | 2°C | -7°C / 18°C | 81 mm | 77% | 17 km/h |
| February | 8°C | 2°C | -6°C / 20°C | 69 mm | 75% | 17 km/h |
| March | 12°C | 4°C | -3°C / 24°C | 89 mm | 69% | 15 km/h |
| April | 17°C | 9°C | 1°C / 29°C | 105 mm | 70% | 14 km/h |
| May | 22°C | 14°C | 5°C / 33°C | 87 mm | 72% | 12 km/h |
| June | 25°C | 19°C | 10°C / 35°C | 104 mm | 79% | 10 km/h |
| July | 30°C | 23°C | 18°C / 37°C | 100 mm | 80% | 10 km/h |
| August | 31°C | 24°C | 13°C / 39°C | 98 mm | 78% | 10 km/h |
| September | 27°C | 20°C | 9°C / 37°C | 98 mm | 78% | 11 km/h |
| October | 21°C | 14°C | 5°C / 33°C | 98 mm | 76% | 13 km/h |
| November | 16°C | 8°C | -1°C / 27°C | 90 mm | 72% | 14 km/h |
| December | 10°C | 3°C | -7°C / 24°C | 110 mm | 76% | 16 km/h |
Best time to visit Shirayamamachi
The most comfortable time to visit Shirayamamachi 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 December, totalling about 1,128 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 110 mm, roughly 2× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Shirayamamachi forecast for what is happening now.
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