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Sumida Weather by Month
Average temperatures, rainfall and humidity for Sumida, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Sumida month looks like before you travel — then check the live Sumida forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
January
2°C average low
Wettest month
September
157 mm of rain
Driest month
January
28 mm of rain
Average temperature and rainfall in Sumida 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 / 18°C | 28 mm | 55% | 13 km/h |
| February | 11°C | 3°C | -5°C / 23°C | 44 mm | 57% | 14 km/h |
| March | 15°C | 7°C | -3°C / 27°C | 83 mm | 62% | 15 km/h |
| April | 19°C | 12°C | 1°C / 29°C | 104 mm | 66% | 15 km/h |
| May | 24°C | 17°C | 7°C / 33°C | 106 mm | 69% | 14 km/h |
| June | 27°C | 20°C | 13°C / 37°C | 151 mm | 73% | 12 km/h |
| July | 31°C | 24°C | 18°C / 38°C | 112 mm | 75% | 12 km/h |
| August | 32°C | 26°C | 17°C / 40°C | 122 mm | 72% | 13 km/h |
| September | 28°C | 22°C | 13°C / 37°C | 157 mm | 76% | 13 km/h |
| October | 22°C | 16°C | 5°C / 33°C | 115 mm | 70% | 13 km/h |
| November | 17°C | 10°C | -1°C / 27°C | 63 mm | 64% | 12 km/h |
| December | 12°C | 4°C | -6°C / 23°C | 36 mm | 56% | 12 km/h |
Best time to visit Sumida
The most comfortable time to visit Sumida is generally May to June and October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around September, totalling about 1,120 mm a year.
Travellers who prefer heat should aim for August, when highs average 32°C. September is the month to avoid if rain would spoil your plans — it averages 157 mm, roughly 6× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Sumida forecast for what is happening now.
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