Climate averages 1991–2020
Itoshima weather
in September.
A warm, very 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 Itoshima: daytime highs average 26.6°C and nights cool to about 21.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 180 mm of rain on roughly 13 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 25 min on an average September day.
The nearest other city in this atlas is Maebaru-chūō (2 km away). In September its highs average 26.3°C, about as warm as Itoshima, with 180 mm of rain.
Among the 303 cities listed in Japan, Itoshima ranks joint 93rd of 303 for the warmest September highs and joint 121st of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Itoshima is 1.0°C warmer than that mean.
From September to October, average highs fall by 4.9°C to 21.7°C, and monthly rainfall falls from 180 mm to 101 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
Itoshima climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.3°C4.1°C | 4.1°C | 64 | 10.2 | 10.210 h |
| February | 9.6°C4.2°C | 4.2°C | 72 | 9.8 | 11.011 h |
| March | 13.0°C6.7°C | 6.7°C | 112 | 11.0 | 12.012 h |
| April | 17.9°C10.7°C | 10.7°C | 126 | 10.4 | 13.013 h |
| May | 22.3°C15.5°C | 15.5°C | 141 | 10.0 | 13.914 h |
| June | 25.4°C19.9°C | 19.9°C | 278 | 14.9 | 14.314 h |
| July | 28.9°C24.1°C | 24.1°C | 262 | 16.6 | 14.114 h |
| August | 30.0°C25.1°C | 25.1°C | 163 | 15.0 | 13.413 h |
| September, selected | 26.6°C21.7°C | 21.7°C | 180 | 12.9 | 12.412 h |
| October | 21.7°C16.6°C | 16.6°C | 101 | 7.7 | 11.411 h |
| November | 16.3°C11.2°C | 11.2°C | 88 | 8.9 | 10.510 h |
| December | 10.8°C6.3°C | 6.3°C | 72 | 9.9 | 10.010 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
- Maebaru-chūō in SeptemberJapan · 2 kmHigh 26.3°C · Low 21.9°C · 180 mm rain
- Fukuoka in SeptemberJapan · 22 kmHigh 27.1°C · Low 20.9°C · 179 mm rain
- Karatsu in SeptemberJapan · 23 kmHigh 27.0°C · Low 21.8°C · 179 mm rain
- Kasuga in SeptemberJapan · 26 kmHigh 27.4°C · Low 20.2°C · 179 mm rain
- Saga in SeptemberJapan · 36 kmHigh 27.1°C · Low 20.2°C · 189 mm rain
- Tosu in SeptemberJapan · 37 kmHigh 27.4°C · Low 19.8°C · 180 mm rain
- Kurume in SeptemberJapan · 40 kmHigh 27.5°C · Low 19.6°C · 180 mm rain
- Munakata in SeptemberJapan · 45 kmHigh 27.1°C · Low 21.1°C · 174 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 Itoshima) is explained once on the Itoshima year overview and on the Sources, method and limits page.
Maebaru-chūō lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.