Climate averages 1991–2020
Kōka 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 Kōka: daytime highs average 26.3°C and nights cool to about 19.2°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 202 mm of rain on roughly 14 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 Youkaichi (16 km away). In September its highs average 26.2°C, about as warm as Kōka, with 202 mm of rain.
Among the 303 cities listed in Japan, Kōka ranks joint 115th of 303 for the warmest September highs and joint 201st of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Kōka is 0.6°C warmer than that mean.
From September to October, average highs fall by 5.6°C to 20.6°C, and monthly rainfall falls from 202 mm to 177 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
Kōka climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.0°C-0.4°C | -0.4°C | 62 | 7.5 | 10.110 h |
| February | 8.0°C-0.2°C | -0.2°C | 69 | 8.7 | 10.911 h |
| March | 11.9°C2.4°C | 2.4°C | 116 | 12.1 | 11.912 h |
| April | 17.3°C7.4°C | 7.4°C | 133 | 11.4 | 13.013 h |
| May | 22.0°C12.7°C | 12.7°C | 156 | 11.5 | 14.014 h |
| June | 25.4°C17.4°C | 17.4°C | 203 | 14.8 | 14.514 h |
| July | 29.0°C21.9°C | 21.9°C | 214 | 17.7 | 14.314 h |
| August | 30.2°C22.8°C | 22.8°C | 148 | 14.9 | 13.513 h |
| September, selected | 26.3°C19.2°C | 19.2°C | 202 | 13.9 | 12.412 h |
| October | 20.6°C13.0°C | 13.0°C | 177 | 10.6 | 11.311 h |
| November | 15.1°C7.1°C | 7.1°C | 84 | 7.4 | 10.410 h |
| December | 9.5°C1.9°C | 1.9°C | 60 | 7.1 | 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
- Youkaichi in SeptemberJapan · 16 kmHigh 26.2°C · Low 19.2°C · 202 mm rain
- Ōmihachiman in SeptemberJapan · 17 kmHigh 26.2°C · Low 19.1°C · 179 mm rain
- Kusatsu in SeptemberJapan · 18 kmHigh 26.7°C · Low 19.4°C · 153 mm rain
- Moriyama in SeptemberJapan · 19 kmHigh 26.3°C · Low 19.3°C · 153 mm rain
- Iga in SeptemberJapan · 25 kmHigh 26.8°C · Low 19.6°C · 223 mm rain
- Ōtsu in SeptemberJapan · 27 kmHigh 26.3°C · Low 18.9°C · 187 mm rain
- Hikone in SeptemberJapan · 31 kmHigh 25.8°C · Low 19.5°C · 212 mm rain
- Uji in SeptemberJapan · 34 kmHigh 26.9°C · Low 19.4°C · 187 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 Kōka) is explained once on the Kōka year overview and on the Sources, method and limits page.
Youkaichi lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.