Climate averages 1991–2020
Seto weather
in September.
A warm, very wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Seto: daytime highs average 26.9°C and nights cool to about 19.2°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 186 mm of rain on roughly 12 days, which makes September a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Tajimi (10 km away). In September its highs average 26.6°C, about as warm as Seto, with 232 mm of rain.
Among the 303 cities listed in Japan, Seto ranks joint 67th of 303 for the warmest September highs and joint 142nd of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Seto is 1.3°C warmer than that mean.
From September to October, average highs fall by 5.6°C to 21.4°C, and monthly rainfall falls from 186 mm to 171 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
Seto climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.8°C-1.1°C | -1.1°C | 54 | 5.7 | 10.110 h |
| February | 9.0°C-0.9°C | -0.9°C | 61 | 6.6 | 10.911 h |
| March | 12.9°C2.0°C | 2.0°C | 110 | 10.1 | 11.912 h |
| April | 18.0°C7.1°C | 7.1°C | 123 | 10.6 | 13.113 h |
| May | 22.5°C12.5°C | 12.5°C | 144 | 10.6 | 14.014 h |
| June | 25.6°C17.4°C | 17.4°C | 178 | 14.3 | 14.514 h |
| July | 28.9°C21.8°C | 21.8°C | 190 | 14.9 | 14.314 h |
| August | 30.5°C22.9°C | 22.9°C | 111 | 11.7 | 13.513 h |
| September, selected | 26.9°C19.2°C | 19.2°C | 186 | 12.1 | 12.412 h |
| October | 21.4°C12.8°C | 12.8°C | 171 | 10.3 | 11.311 h |
| November | 15.7°C6.4°C | 6.4°C | 85 | 7.2 | 10.310 h |
| December | 10.2°C1.1°C | 1.1°C | 55 | 6.0 | 9.810 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
- Tajimi in SeptemberJapan · 10 kmHigh 26.6°C · Low 18.8°C · 232 mm rain
- Kasugai in SeptemberJapan · 12 kmHigh 27.3°C · Low 19.6°C · 186 mm rain
- Toyota in SeptemberJapan · 17 kmHigh 27.1°C · Low 19.5°C · 239 mm rain
- Komaki in SeptemberJapan · 18 kmHigh 26.9°C · Low 19.0°C · 186 mm rain
- Nagoya in SeptemberJapan · 19 kmHigh 27.1°C · Low 19.5°C · 186 mm rain
- Kani in SeptemberJapan · 19 kmHigh 26.5°C · Low 18.5°C · 216 mm rain
- Ama in SeptemberJapan · 28 kmHigh 27.0°C · Low 19.6°C · 248 mm rain
- Ichinomiya in SeptemberJapan · 28 kmHigh 26.7°C · Low 19.1°C · 248 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 Seto) is explained once on the Seto year overview and on the Sources, method and limits page.
Nagoya, Kasugai and Komaki lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.