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Onomichi Weather by Month
Average temperatures, rainfall and humidity for Onomichi, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Onomichi month looks like before you travel — then check the live Onomichi forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
January
2°C average low
Wettest month
June
161 mm of rain
Driest month
January
41 mm of rain
Average temperature and rainfall in Onomichi 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 | 2°C | -7°C / 18°C | 41 mm | 74% | 12 km/h |
| February | 10°C | 2°C | -6°C / 21°C | 62 mm | 72% | 12 km/h |
| March | 14°C | 6°C | -3°C / 25°C | 87 mm | 69% | 11 km/h |
| April | 19°C | 10°C | 0°C / 29°C | 111 mm | 69% | 10 km/h |
| May | 24°C | 15°C | 4°C / 33°C | 78 mm | 72% | 8 km/h |
| June | 26°C | 19°C | 12°C / 36°C | 161 mm | 80% | 8 km/h |
| July | 31°C | 24°C | 16°C / 39°C | 122 mm | 81% | 8 km/h |
| August | 32°C | 24°C | 17°C / 38°C | 108 mm | 78% | 9 km/h |
| September | 28°C | 21°C | 13°C / 37°C | 106 mm | 80% | 9 km/h |
| October | 23°C | 14°C | 6°C / 32°C | 77 mm | 75% | 10 km/h |
| November | 17°C | 9°C | 1°C / 27°C | 47 mm | 75% | 10 km/h |
| December | 11°C | 4°C | -4°C / 22°C | 48 mm | 75% | 11 km/h |
Best time to visit Onomichi
The most comfortable time to visit Onomichi is generally May and September to 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 1,048 mm a year.
Travellers who prefer heat should aim for August, when highs average 32°C. June is the month to avoid if rain would spoil your plans — it averages 161 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 Onomichi forecast for what is happening now.
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