Climate averages 1991–2020
Iida 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 Iida: daytime highs average 25.3°C and nights cool to about 17.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 228 mm of rain on roughly 16 days, which makes September a very wet month (the 10th 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 Nakatsugawa (29 km away). In September its highs average 26.2°C, 0.8°C warmer than Iida, with 234 mm of rain.
Among the 303 cities listed in Japan, Iida ranks joint 202nd of 303 for the warmest September highs and 251st of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Iida is 0.3°C cooler than that mean.
From September to October, average highs fall by 5.5°C to 19.8°C, and monthly rainfall falls from 228 mm to 210 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
Iida climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.0°C-4.5°C | -4.5°C | 99 | 11.8 | 10.010 h |
| February | 5.3°C-3.9°C | -3.9°C | 109 | 10.4 | 10.911 h |
| March | 9.7°C0.4°C | 0.4°C | 171 | 13.1 | 11.912 h |
| April | 16.3°C5.9°C | 5.9°C | 174 | 12.8 | 13.113 h |
| May | 21.2°C11.3°C | 11.3°C | 191 | 13.7 | 14.014 h |
| June | 24.2°C16.0°C | 16.0°C | 263 | 18.0 | 14.515 h |
| July | 27.5°C20.1°C | 20.1°C | 308 | 20.3 | 14.314 h |
| August | 28.8°C20.9°C | 20.9°C | 184 | 18.5 | 13.513 h |
| September, selected | 25.3°C17.4°C | 17.4°C | 228 | 15.5 | 12.412 h |
| October | 19.8°C11.3°C | 11.3°C | 210 | 12.9 | 11.311 h |
| November | 13.8°C5.0°C | 5.0°C | 126 | 10.4 | 10.310 h |
| December | 7.3°C-0.7°C | -0.7°C | 100 | 12.0 | 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
- Nakatsugawa in SeptemberJapan · 29 kmHigh 26.2°C · Low 17.9°C · 234 mm rain
- Minami-Alps in SeptemberJapan · 59 kmHigh 25.3°C · Low 17.9°C · 270 mm rain
- Kai in SeptemberJapan · 65 kmHigh 25.3°C · Low 17.8°C · 185 mm rain
- Tajimi in SeptemberJapan · 66 kmHigh 26.6°C · Low 18.8°C · 232 mm rain
- Kofu in SeptemberJapan · 69 kmHigh 25.7°C · Low 18.2°C · 185 mm rain
- Kani in SeptemberJapan · 70 kmHigh 26.5°C · Low 18.5°C · 216 mm rain
- Seto in SeptemberJapan · 73 kmHigh 26.9°C · Low 19.2°C · 186 mm rain
- Toyota in SeptemberJapan · 78 kmHigh 27.1°C · Low 19.5°C · 239 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 Iida) is explained once on the Iida year overview and on the Sources, method and limits page.