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Hamamatsu Weather by Month
Average temperatures, rainfall and humidity for Hamamatsu, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Hamamatsu month looks like before you travel — then check the live Hamamatsu forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
January
3°C average low
Wettest month
April
180 mm of rain
Driest month
January
39 mm of rain
Average temperature and rainfall in Hamamatsu 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 | 11°C | 3°C | -7°C / 25°C | 39 mm | 66% | 15 km/h |
| February | 12°C | 3°C | -7°C / 23°C | 73 mm | 66% | 14 km/h |
| March | 16°C | 7°C | -3°C / 25°C | 151 mm | 67% | 13 km/h |
| April | 20°C | 11°C | 0°C / 27°C | 180 mm | 70% | 12 km/h |
| May | 24°C | 15°C | 7°C / 31°C | 133 mm | 73% | 10 km/h |
| June | 26°C | 20°C | 12°C / 34°C | 174 mm | 81% | 9 km/h |
| July | 30°C | 24°C | 16°C / 39°C | 176 mm | 82% | 9 km/h |
| August | 32°C | 25°C | 18°C / 42°C | 121 mm | 80% | 9 km/h |
| September | 29°C | 22°C | 12°C / 36°C | 122 mm | 81% | 9 km/h |
| October | 24°C | 16°C | 4°C / 32°C | 115 mm | 77% | 9 km/h |
| November | 19°C | 11°C | 1°C / 27°C | 80 mm | 74% | 10 km/h |
| December | 13°C | 5°C | -6°C / 22°C | 46 mm | 69% | 14 km/h |
Best time to visit Hamamatsu
The most comfortable time to visit Hamamatsu 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 1,411 mm a year.
Travellers who prefer heat should aim for August, when highs average 32°C. April is the month to avoid if rain would spoil your plans — it averages 180 mm, roughly 5× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Hamamatsu forecast for what is happening now.