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Seto Weather by Month
Average temperatures, rainfall and humidity for Seto, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Seto month looks like before you travel — then check the live Seto forecast for the days ahead.
Warmest month
August
34°C average high
Coolest month
January
0°C average low
Wettest month
April
174 mm of rain
Driest month
January
44 mm of rain
Average temperature and rainfall in Seto 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 | 0°C | -13°C / 18°C | 44 mm | 71% | 12 km/h |
| February | 10°C | 1°C | -14°C / 20°C | 103 mm | 68% | 12 km/h |
| March | 14°C | 5°C | -9°C / 26°C | 159 mm | 67% | 12 km/h |
| April | 19°C | 10°C | -6°C / 30°C | 174 mm | 69% | 11 km/h |
| May | 25°C | 15°C | 1°C / 37°C | 107 mm | 68% | 9 km/h |
| June | 28°C | 19°C | 9°C / 38°C | 162 mm | 74% | 8 km/h |
| July | 32°C | 24°C | 14°C / 41°C | 161 mm | 75% | 8 km/h |
| August | 34°C | 25°C | 14°C / 42°C | 136 mm | 71% | 9 km/h |
| September | 30°C | 22°C | 8°C / 39°C | 113 mm | 73% | 9 km/h |
| October | 23°C | 15°C | -1°C / 34°C | 104 mm | 72% | 10 km/h |
| November | 17°C | 9°C | -6°C / 26°C | 63 mm | 71% | 11 km/h |
| December | 11°C | 3°C | -13°C / 21°C | 52 mm | 72% | 12 km/h |
Best time to visit Seto
The most comfortable time to visit Seto 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 April, totalling about 1,378 mm a year.
Travellers who prefer heat should aim for August, when highs average 34°C. April 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 Seto forecast for what is happening now.
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