Climate averages 1991–2020
Sendai, Japan weather
in August.
A hot, wet month: the warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Sendai, Japan: daytime highs average 30.1°C and nights cool to about 25.5°C. By daytime temperature it is the warmest month of the year.
Expect about 166 mm of rain on roughly 16 days, which makes August a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 19 min on an average August day.
The nearest other city in this atlas is Aira (28 km away). In August its highs average 30.3°C, about as warm as Sendai, Japan, with 173 mm of rain.
Among the 303 cities listed in Japan, Sendai, Japan ranks joint 90th of 303 for the warmest August highs and joint 207th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Sendai, Japan is 1.0°C warmer than that mean.
From August to September, average highs fall by 2.2°C to 27.9°C, and monthly rainfall rises from 166 mm to 198 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sendai, Japan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 11.1°C6.8°C | 6.8°C | 98 | 12.3 | 10.310 h |
| February | 12.0°C7.0°C | 7.0°C | 115 | 11.3 | 11.011 h |
| March | 15.0°C9.2°C | 9.2°C | 161 | 13.4 | 12.012 h |
| April | 19.1°C12.8°C | 12.8°C | 186 | 11.7 | 12.913 h |
| May | 23.0°C16.9°C | 16.9°C | 205 | 11.3 | 13.814 h |
| June | 25.6°C20.8°C | 20.8°C | 500 | 18.5 | 14.214 h |
| July | 29.1°C24.6°C | 24.6°C | 324 | 17.6 | 14.014 h |
| August, selected | 30.1°C25.5°C | 25.5°C | 166 | 15.7 | 13.313 h |
| September | 27.9°C23.1°C | 23.1°C | 198 | 13.1 | 12.412 h |
| October | 23.6°C18.5°C | 18.5°C | 109 | 8.6 | 11.411 h |
| November | 18.4°C13.6°C | 13.6°C | 122 | 9.3 | 10.611 h |
| December | 13.3°C8.9°C | 8.9°C | 102 | 10.6 | 10.110 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Aira in AugustJapan · 28 kmHigh 30.3°C · Low 24.2°C · 173 mm rain
- Kagoshima in AugustJapan · 37 kmHigh 30.4°C · Low 25.3°C · 167 mm rain
- Kirishima in AugustJapan · 45 kmHigh 31.1°C · Low 24.7°C · 174 mm rain
- Kanoya in AugustJapan · 71 kmHigh 30.3°C · Low 24.9°C · 178 mm rain
- Amakusa in AugustJapan · 72 kmHigh 30.8°C · Low 25.0°C · 183 mm rain
- Miyakonojō in AugustJapan · 73 kmHigh 30.1°C · Low 24.2°C · 199 mm rain
- Honmachi in AugustJapan · 82 kmHigh 30.8°C · Low 24.6°C · 162 mm rain
- Miyazaki in AugustJapan · 106 kmHigh 29.4°C · Low 24.9°C · 209 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sendai) is explained once on the Sendai, Japan year overview and on the Sources, method and limits page.