Climate averages 1991–2020
Sendai weather
in September.
A warm, wet month: the 3rd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Sendai: daytime highs average 23.3°C and nights cool to about 17.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 167 mm of rain on roughly 14 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 28 min on an average September day.
The nearest other city in this atlas is Natori-shi (11 km away). In September its highs average 23.4°C, about as warm as Sendai, with 179 mm of rain.
Among the 303 cities listed in Japan, Sendai ranks joint 275th of 303 for the warmest September highs and joint 66th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Sendai is 2.4°C cooler than that mean.
From September to October, average highs fall by 5.1°C to 18.2°C, and monthly rainfall falls from 167 mm to 141 mm.
The annual picture
September 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 | 26.2°C21.0°C | 21.0°C | 169 | 16.1 | 13.614 h |
| September, selected | 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
September in nearby cities
- Natori-shi in SeptemberJapan · 11 kmHigh 23.4°C · Low 18.4°C · 179 mm rain
- Ōsaki in SeptemberJapan · 37 kmHigh 23.6°C · Low 16.7°C · 168 mm rain
- Ishinomaki in SeptemberJapan · 41 kmHigh 23.1°C · Low 19.2°C · 151 mm rain
- Yamagata in SeptemberJapan · 44 kmHigh 22.8°C · Low 15.5°C · 125 mm rain
- Tome in SeptemberJapan · 55 kmHigh 23.6°C · Low 17.0°C · 145 mm rain
- Fukushima in SeptemberJapan · 67 kmHigh 24.1°C · Low 16.9°C · 169 mm rain
- Ichinoseki in SeptemberJapan · 76 kmHigh 23.3°C · Low 16.1°C · 149 mm rain
- Yonezawa in SeptemberJapan · 77 kmHigh 23.6°C · Low 16.7°C · 155 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.