Climate averages 1991–2020
Kawaguchi weather
in September.
A warm, very wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Kawaguchi: daytime highs average 26.3°C and nights cool to about 19.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 180 mm of rain on roughly 14 days, which makes September a very wet month (the 11th 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 Sōka (9 km away). In September its highs average 26.3°C, about as warm as Kawaguchi, with 180 mm of rain.
Among the 303 cities listed in Japan, Kawaguchi ranks joint 115th 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; Kawaguchi is 0.7°C warmer than that mean.
From September to October, average highs fall by 5.5°C to 20.8°C, and monthly rainfall rises from 180 mm to 209 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
Kawaguchi climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.2°C-1.2°C | -1.2°C | 66 | 6.9 | 10.010 h |
| February | 9.2°C-0.5°C | -0.5°C | 63 | 7.6 | 10.911 h |
| March | 12.7°C3.1°C | 3.1°C | 113 | 11.6 | 11.912 h |
| April | 17.7°C8.3°C | 8.3°C | 113 | 11.4 | 13.113 h |
| May | 22.3°C13.7°C | 13.7°C | 129 | 11.8 | 14.014 h |
| June | 25.0°C18.0°C | 18.0°C | 159 | 13.6 | 14.515 h |
| July | 28.7°C22.1°C | 22.1°C | 149 | 12.9 | 14.314 h |
| August | 30.2°C23.4°C | 23.4°C | 110 | 10.8 | 13.514 h |
| September, selected | 26.3°C19.9°C | 19.9°C | 180 | 13.6 | 12.412 h |
| October | 20.8°C13.8°C | 13.8°C | 209 | 12.9 | 11.311 h |
| November | 15.6°C7.5°C | 7.5°C | 91 | 9.8 | 10.310 h |
| December | 10.6°C1.8°C | 1.8°C | 59 | 7.4 | 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
- Sōka in SeptemberJapan · 9 kmHigh 26.3°C · Low 20.0°C · 180 mm rain
- Yono in SeptemberJapan · 11 kmHigh 26.0°C · Low 19.4°C · 171 mm rain
- Koshigaya in SeptemberJapan · 12 kmHigh 26.3°C · Low 19.8°C · 171 mm rain
- Saitama in SeptemberJapan · 12 kmHigh 26.3°C · Low 19.6°C · 171 mm rain
- Tokyo in SeptemberJapan · 13 kmHigh 25.9°C · Low 20.0°C · 180 mm rain
- Niiza in SeptemberJapan · 14 kmHigh 26.0°C · Low 19.6°C · 204 mm rain
- Katsushika in SeptemberJapan · 15 kmHigh 26.2°C · Low 20.4°C · 180 mm rain
- Matsudo in SeptemberJapan · 17 kmHigh 26.3°C · Low 20.1°C · 175 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 Kawaguchi) is explained once on the Kawaguchi year overview and on the Sources, method and limits page.
Tokyo, Katsushika and Sōka lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.