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Sendai Weather by Month
Average temperatures, rainfall and humidity for Sendai, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Sendai month looks like before you travel — then check the live Sendai forecast for the days ahead.
Warmest month
August
29°C average high
Coolest month
January
-3°C average low
Wettest month
July
114 mm of rain
Driest month
January
24 mm of rain
Average temperature and rainfall in Sendai 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 | 6°C | -3°C | -12°C / 19°C | 24 mm | 71% | 14 km/h |
| February | 6°C | -2°C | -13°C / 20°C | 31 mm | 67% | 14 km/h |
| March | 10°C | 1°C | -7°C / 23°C | 58 mm | 65% | 14 km/h |
| April | 16°C | 7°C | -3°C / 26°C | 89 mm | 66% | 13 km/h |
| May | 20°C | 11°C | 0°C / 32°C | 83 mm | 72% | 11 km/h |
| June | 23°C | 16°C | 7°C / 35°C | 90 mm | 82% | 10 km/h |
| July | 28°C | 21°C | 10°C / 38°C | 114 mm | 85% | 9 km/h |
| August | 29°C | 22°C | 14°C / 38°C | 109 mm | 84% | 9 km/h |
| September | 25°C | 17°C | 5°C / 35°C | 103 mm | 82% | 10 km/h |
| October | 19°C | 11°C | -1°C / 31°C | 90 mm | 76% | 11 km/h |
| November | 14°C | 5°C | -7°C / 23°C | 48 mm | 72% | 11 km/h |
| December | 8°C | 0°C | -13°C / 20°C | 37 mm | 73% | 12 km/h |
Best time to visit Sendai
The most comfortable time to visit Sendai is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around July, totalling about 877 mm a year.
Travellers who prefer heat should aim for August, when highs average 29°C. July is the month to avoid if rain would spoil your plans — it averages 114 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 Sendai forecast for what is happening now.