Climate averages 1991–2020
Sendai, Japan weather
in September.
A warm, very wet month: the 3rd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Sendai, Japan: daytime highs average 27.9°C and nights cool to about 23.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 198 mm of rain on roughly 13 days, which makes September a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 23 min on an average September day.
The nearest other city in this atlas is Aira (28 km away). In September its highs average 28.0°C, about as warm as Sendai, Japan, with 197 mm of rain.
Among the 303 cities listed in Japan, Sendai, Japan ranks joint 8th of 303 for the warmest September highs and joint 188th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Sendai, Japan is 2.3°C warmer than that mean.
From September to October, average highs fall by 4.4°C to 23.6°C, and monthly rainfall falls from 198 mm to 109 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, 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 | 30.1°C25.5°C | 25.5°C | 166 | 15.7 | 13.313 h |
| September, selected | 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
September in nearby cities
- Aira in SeptemberJapan · 28 kmHigh 28.0°C · Low 21.5°C · 197 mm rain
- Kagoshima in SeptemberJapan · 37 kmHigh 28.2°C · Low 22.9°C · 202 mm rain
- Kirishima in SeptemberJapan · 45 kmHigh 28.7°C · Low 21.9°C · 202 mm rain
- Kanoya in SeptemberJapan · 71 kmHigh 28.1°C · Low 22.6°C · 212 mm rain
- Amakusa in SeptemberJapan · 72 kmHigh 28.1°C · Low 22.1°C · 197 mm rain
- Miyakonojō in SeptemberJapan · 73 kmHigh 27.6°C · Low 21.6°C · 233 mm rain
- Honmachi in SeptemberJapan · 82 kmHigh 27.9°C · Low 21.5°C · 174 mm rain
- Miyazaki in SeptemberJapan · 106 kmHigh 27.0°C · Low 22.5°C · 268 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.