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Ōnojō Weather by Month
Average temperatures, rainfall and humidity for Ōnojō, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Ōnojō month looks like before you travel — then check the live Ōnojō forecast for the days ahead.
Warmest month
August
33°C average high
Coolest month
January
2°C average low
Wettest month
June
189 mm of rain
Driest month
January
52 mm of rain
Average temperature and rainfall in Ōnojō 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 | -9°C / 24°C | 52 mm | 66% | 10 km/h |
| February | 11°C | 3°C | -7°C / 22°C | 73 mm | 64% | 11 km/h |
| March | 16°C | 7°C | -6°C / 27°C | 79 mm | 65% | 11 km/h |
| April | 21°C | 11°C | 2°C / 29°C | 120 mm | 65% | 10 km/h |
| May | 25°C | 16°C | 2°C / 33°C | 105 mm | 64% | 9 km/h |
| June | 28°C | 20°C | 11°C / 37°C | 189 mm | 72% | 9 km/h |
| July | 32°C | 25°C | 13°C / 41°C | 153 mm | 70% | 10 km/h |
| August | 33°C | 25°C | 18°C / 42°C | 143 mm | 69% | 9 km/h |
| September | 30°C | 22°C | 13°C / 40°C | 133 mm | 73% | 9 km/h |
| October | 24°C | 15°C | 4°C / 34°C | 73 mm | 67% | 10 km/h |
| November | 18°C | 9°C | 0°C / 29°C | 58 mm | 66% | 9 km/h |
| December | 12°C | 4°C | -7°C / 23°C | 58 mm | 64% | 10 km/h |
Best time to visit Ōnojō
The most comfortable time to visit Ōnojō 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 June, totalling about 1,236 mm a year.
Travellers who prefer heat should aim for August, when highs average 33°C. June is the month to avoid if rain would spoil your plans — it averages 189 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 Ōnojō forecast for what is happening now.