Climate averages 1991–2020
Sendai weather
in August.
A warm, wet month: the warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Sendai: daytime highs average 26.2°C and nights cool to about 21.0°C. By daytime temperature it is the warmest month of the year.
Expect about 169 mm of rain on roughly 16 days, which makes August a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 39 min on an average August day.
The nearest other city in this atlas is Natori-shi (11 km away). In August its highs average 26.0°C, about as warm as Sendai, with 162 mm of rain.
Among the 303 cities listed in Japan, Sendai ranks 287th of 303 for the warmest August highs and joint 214th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Sendai is 2.9°C cooler than that mean.
From August to September, average highs fall by 3.0°C to 23.3°C, and monthly rainfall falls from 169 mm to 167 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 climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.1°C-2.6°C | -2.6°C | 63 | 11.1 | 9.810 h |
| February | 4.9°C-2.9°C | -2.9°C | 49 | 9.3 | 10.711 h |
| March | 8.4°C-0.1°C | -0.1°C | 87 | 11.6 | 11.912 h |
| April | 13.8°C4.7°C | 4.7°C | 94 | 11.2 | 13.213 h |
| May | 18.3°C10.3°C | 10.3°C | 103 | 11.4 | 14.214 h |
| June | 21.2°C15.1°C | 15.1°C | 129 | 13.4 | 14.815 h |
| July | 24.7°C19.4°C | 19.4°C | 187 | 17.3 | 14.515 h |
| August, selected | 26.2°C21.0°C | 21.0°C | 169 | 16.1 | 13.614 h |
| September | 23.3°C17.7°C | 17.7°C | 167 | 14.3 | 12.512 h |
| October | 18.2°C11.6°C | 11.6°C | 141 | 11.0 | 11.211 h |
| November | 12.6°C5.2°C | 5.2°C | 63 | 9.3 | 10.110 h |
| December | 6.9°C0.3°C | 0.3°C | 58 | 11.0 | 9.610 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
- Natori-shi in AugustJapan · 11 kmHigh 26.0°C · Low 21.4°C · 162 mm rain
- Ōsaki in AugustJapan · 37 kmHigh 27.2°C · Low 20.4°C · 165 mm rain
- Ishinomaki in AugustJapan · 41 kmHigh 25.6°C · Low 21.8°C · 131 mm rain
- Yamagata in AugustJapan · 44 kmHigh 26.9°C · Low 19.5°C · 146 mm rain
- Tome in AugustJapan · 55 kmHigh 27.1°C · Low 20.5°C · 135 mm rain
- Fukushima in AugustJapan · 67 kmHigh 27.9°C · Low 20.7°C · 163 mm rain
- Ichinoseki in AugustJapan · 76 kmHigh 26.9°C · Low 19.8°C · 142 mm rain
- Yonezawa in AugustJapan · 77 kmHigh 27.7°C · Low 20.6°C · 183 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 year overview and on the Sources, method and limits page.