Climate averages 1991–2020
Kusatsu weather
in September.
A warm, 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 Kusatsu: daytime highs average 26.7°C and nights cool to about 19.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 153 mm of rain on roughly 12 days, which makes September a 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 Moriyama (6 km away). In September its highs average 26.3°C, about as warm as Kusatsu, with 153 mm of rain.
Among the 303 cities listed in Japan, Kusatsu ranks joint 83rd of 303 for the warmest September highs and joint 30th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Kusatsu is 1.0°C warmer than that mean.
From September to October, average highs fall by 5.8°C to 20.9°C, and monthly rainfall falls from 153 mm to 148 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
Kusatsu 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-0.2°C | -0.2°C | 61 | 8.3 | 10.110 h |
| February | 8.2°C0.0°C | 0.0°C | 66 | 9.2 | 10.911 h |
| March | 12.1°C2.6°C | 2.6°C | 110 | 12.2 | 11.912 h |
| April | 17.6°C7.6°C | 7.6°C | 119 | 11.0 | 13.013 h |
| May | 22.4°C12.9°C | 12.9°C | 138 | 10.7 | 14.014 h |
| June | 25.7°C17.6°C | 17.6°C | 177 | 12.9 | 14.514 h |
| July | 29.3°C22.0°C | 22.0°C | 181 | 14.8 | 14.314 h |
| August | 30.8°C23.1°C | 23.1°C | 103 | 11.1 | 13.513 h |
| September, selected | 26.7°C19.4°C | 19.4°C | 153 | 11.5 | 12.412 h |
| October | 20.9°C13.3°C | 13.3°C | 148 | 9.6 | 11.311 h |
| November | 15.3°C7.3°C | 7.3°C | 74 | 6.7 | 10.410 h |
| December | 9.7°C2.1°C | 2.1°C | 58 | 7.7 | 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
- Moriyama in SeptemberJapan · 6 kmHigh 26.3°C · Low 19.3°C · 153 mm rain
- Ōtsu in SeptemberJapan · 9 kmHigh 26.3°C · Low 18.9°C · 187 mm rain
- Ōmihachiman in SeptemberJapan · 17 kmHigh 26.2°C · Low 19.1°C · 179 mm rain
- Kōka in SeptemberJapan · 18 kmHigh 26.3°C · Low 19.2°C · 202 mm rain
- Kyoto in SeptemberJapan · 19 kmHigh 26.8°C · Low 19.4°C · 187 mm rain
- Uji in SeptemberJapan · 20 kmHigh 26.9°C · Low 19.4°C · 187 mm rain
- Youkaichi in SeptemberJapan · 24 kmHigh 26.2°C · Low 19.2°C · 202 mm rain
- Jōyō in SeptemberJapan · 24 kmHigh 26.8°C · Low 19.3°C · 140 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 Kusatsu) is explained once on the Kusatsu year overview and on the Sources, method and limits page.
Moriyama lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.