Climate averages 1991–2020
Ikoma weather
in September.
A warm, 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 Ikoma: daytime highs average 26.8°C and nights cool to about 19.2°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 140 mm of rain on roughly 11 days, which makes September a wet month (the 9th 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 Nara-shi (10 km away). In September its highs average 27.3°C, about as warm as Ikoma, with 140 mm of rain.
Among the 303 cities listed in Japan, Ikoma ranks joint 72nd of 303 for the warmest September highs and joint 10th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Ikoma is 1.1°C warmer than that mean.
From September to October, average highs fall by 6.0°C to 20.8°C, and monthly rainfall rises from 140 mm to 143 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
Ikoma climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.2°C-0.4°C | -0.4°C | 58 | 6.4 | 10.110 h |
| February | 8.3°C-0.3°C | -0.3°C | 64 | 7.8 | 10.911 h |
| March | 12.1°C2.4°C | 2.4°C | 107 | 10.9 | 11.912 h |
| April | 17.4°C7.4°C | 7.4°C | 112 | 10.4 | 13.013 h |
| May | 22.2°C12.6°C | 12.6°C | 129 | 10.1 | 14.014 h |
| June | 25.5°C17.5°C | 17.5°C | 180 | 12.3 | 14.414 h |
| July | 28.9°C21.9°C | 21.9°C | 161 | 13.6 | 14.214 h |
| August | 30.8°C23.1°C | 23.1°C | 89 | 9.0 | 13.513 h |
| September, selected | 26.8°C19.2°C | 19.2°C | 140 | 10.7 | 12.412 h |
| October | 20.8°C12.9°C | 12.9°C | 143 | 9.5 | 11.311 h |
| November | 15.2°C6.8°C | 6.8°C | 75 | 7.1 | 10.410 h |
| December | 9.7°C1.8°C | 1.8°C | 57 | 6.6 | 9.910 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
- Nara-shi in SeptemberJapan · 10 kmHigh 27.3°C · Low 19.7°C · 140 mm rain
- Yamatokōriyama in SeptemberJapan · 11 kmHigh 27.2°C · Low 19.7°C · 173 mm rain
- Higashiosaka in SeptemberJapan · 11 kmHigh 27.8°C · Low 20.3°C · 163 mm rain
- Yao in SeptemberJapan · 12 kmHigh 27.4°C · Low 20.0°C · 158 mm rain
- Katano in SeptemberJapan · 12 kmHigh 27.2°C · Low 19.6°C · 140 mm rain
- Hirakata in SeptemberJapan · 15 kmHigh 27.4°C · Low 20.0°C · 140 mm rain
- Kashiba in SeptemberJapan · 17 kmHigh 27.3°C · Low 19.4°C · 173 mm rain
- Osaka in SeptemberJapan · 18 kmHigh 27.6°C · Low 20.4°C · 163 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 Ikoma) is explained once on the Ikoma year overview and on the Sources, method and limits page.
Hirakata, Nara-shi and Katano lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.