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Ōtsu Weather by Month
Average temperatures, rainfall and humidity for Ōtsu, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Ōtsu month looks like before you travel — then check the live Ōtsu forecast for the days ahead.
Warmest month
August
33°C average high
Coolest month
January
1°C average low
Wettest month
June
170 mm of rain
Driest month
January
45 mm of rain
Average temperature and rainfall in Ōtsu 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 | 1°C | -13°C / 16°C | 45 mm | 76% | 9 km/h |
| February | 10°C | 1°C | -14°C / 21°C | 68 mm | 72% | 9 km/h |
| March | 14°C | 4°C | -5°C / 25°C | 105 mm | 69% | 9 km/h |
| April | 20°C | 9°C | -3°C / 29°C | 131 mm | 68% | 9 km/h |
| May | 24°C | 14°C | 3°C / 33°C | 106 mm | 69% | 9 km/h |
| June | 27°C | 19°C | 8°C / 38°C | 170 mm | 75% | 8 km/h |
| July | 32°C | 24°C | 14°C / 39°C | 164 mm | 77% | 8 km/h |
| August | 33°C | 25°C | 14°C / 44°C | 133 mm | 73% | 8 km/h |
| September | 29°C | 21°C | 9°C / 37°C | 116 mm | 75% | 8 km/h |
| October | 23°C | 14°C | 2°C / 34°C | 100 mm | 75% | 9 km/h |
| November | 17°C | 8°C | -3°C / 26°C | 59 mm | 74% | 8 km/h |
| December | 12°C | 3°C | -7°C / 24°C | 53 mm | 75% | 10 km/h |
Best time to visit Ōtsu
The most comfortable time to visit Ōtsu 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 1,249 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 170 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 Ōtsu forecast for what is happening now.