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Shūnan Weather by Month
Average temperatures, rainfall and humidity for Shūnan, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Shūnan month looks like before you travel — then check the live Shūnan forecast for the days ahead.
Warmest month
August
31°C average high
Coolest month
January
2°C average low
Wettest month
June
165 mm of rain
Driest month
January
43 mm of rain
Average temperature and rainfall in Shūnan 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 | 10°C | 2°C | -7°C / 17°C | 43 mm | 69% | 12 km/h |
| February | 10°C | 3°C | -7°C / 19°C | 64 mm | 69% | 12 km/h |
| March | 14°C | 6°C | -4°C / 23°C | 80 mm | 69% | 11 km/h |
| April | 18°C | 11°C | -2°C / 26°C | 117 mm | 70% | 11 km/h |
| May | 22°C | 15°C | 3°C / 29°C | 85 mm | 72% | 10 km/h |
| June | 25°C | 20°C | 10°C / 35°C | 165 mm | 80% | 9 km/h |
| July | 29°C | 24°C | 16°C / 37°C | 112 mm | 82% | 10 km/h |
| August | 31°C | 25°C | 18°C / 41°C | 106 mm | 79% | 11 km/h |
| September | 28°C | 21°C | 12°C / 38°C | 121 mm | 78% | 10 km/h |
| October | 23°C | 15°C | 5°C / 35°C | 71 mm | 72% | 11 km/h |
| November | 18°C | 9°C | 1°C / 44°C | 48 mm | 71% | 12 km/h |
| December | 12°C | 4°C | -6°C / 22°C | 49 mm | 69% | 13 km/h |
Best time to visit Shūnan
The most comfortable time to visit Shūnan 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 1,060 mm a year.
Travellers who prefer heat should aim for August, when highs average 31°C. June is the month to avoid if rain would spoil your plans — it averages 165 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 Shūnan forecast for what is happening now.