Climate averages 1991–2020
Koshigaya weather
in October.
A mild, very wet month: the 6th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Koshigaya: daytime highs average 20.8°C and nights cool to about 13.7°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 190 mm of rain on roughly 13 days, which makes October a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 18 min on an average October day.
The nearest other city in this atlas is Sōka (6 km away). In October its highs average 20.8°C, about as warm as Koshigaya, with 209 mm of rain.
Among the 303 cities listed in Japan, Koshigaya ranks joint 139th of 303 for the warmest October highs and joint 189th of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Koshigaya is 0.5°C warmer than that mean.
From October to November, average highs fall by 5.2°C to 15.6°C, and monthly rainfall falls from 190 mm to 81 mm.
The annual picture
October 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
Koshigaya 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-1.4°C | -1.4°C | 57 | 6.1 | 10.010 h |
| February | 9.2°C-0.6°C | -0.6°C | 55 | 6.9 | 10.911 h |
| March | 12.8°C2.9°C | 2.9°C | 99 | 10.8 | 11.912 h |
| April | 17.8°C8.1°C | 8.1°C | 105 | 11.1 | 13.113 h |
| May | 22.4°C13.5°C | 13.5°C | 128 | 12.2 | 14.014 h |
| June | 25.1°C17.7°C | 17.7°C | 152 | 14.1 | 14.515 h |
| July | 28.7°C21.8°C | 21.8°C | 159 | 14.6 | 14.314 h |
| August | 30.1°C23.2°C | 23.2°C | 118 | 12.3 | 13.514 h |
| September | 26.3°C19.8°C | 19.8°C | 171 | 13.7 | 12.412 h |
| October, selected | 20.8°C13.7°C | 13.7°C | 190 | 12.6 | 11.311 h |
| November | 15.6°C7.3°C | 7.3°C | 81 | 9.2 | 10.310 h |
| December | 10.6°C1.5°C | 1.5°C | 52 | 6.5 | 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
October in nearby cities
- Sōka in OctoberJapan · 6 kmHigh 20.8°C · Low 14.0°C · 209 mm rain
- Nagareyama in OctoberJapan · 11 kmHigh 20.8°C · Low 13.8°C · 207 mm rain
- Kasukabe in OctoberJapan · 11 kmHigh 20.8°C · Low 13.4°C · 190 mm rain
- Kawaguchi in OctoberJapan · 12 kmHigh 20.8°C · Low 13.8°C · 209 mm rain
- Saitama in OctoberJapan · 12 kmHigh 20.7°C · Low 13.5°C · 190 mm rain
- Yono in OctoberJapan · 14 kmHigh 20.5°C · Low 13.2°C · 190 mm rain
- Matsudo in OctoberJapan · 16 kmHigh 20.9°C · Low 14.2°C · 207 mm rain
- Kashiwa in OctoberJapan · 17 kmHigh 20.8°C · Low 14.0°C · 207 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 Koshigaya) is explained once on the Koshigaya year overview and on the Sources, method and limits page.
Saitama, Kasukabe and Kukichūō lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.