Climate averages 1991–2020
Koga weather
in October.
A mild, very wet month: the 6th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Koga: daytime highs average 20.5°C and nights cool to about 13.0°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 200 mm of rain on roughly 14 days, which makes October a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 18 min on an average October day.
The nearest other city in this atlas is Kazo (13 km away). In October its highs average 20.6°C, about as warm as Koga, with 196 mm of rain.
Among the 303 cities listed in Japan, Koga ranks joint 176th of 303 for the warmest October highs and joint 212th of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Koga is 0.1°C warmer than that mean.
From October to November, average highs fall by 5.3°C to 15.2°C, and monthly rainfall falls from 200 mm to 88 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
Koga climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.6°C-2.1°C | -2.1°C | 55 | 6.0 | 10.010 h |
| February | 8.8°C-1.3°C | -1.3°C | 55 | 6.9 | 10.811 h |
| March | 12.5°C1.9°C | 1.9°C | 106 | 11.6 | 11.912 h |
| April | 17.7°C7.1°C | 7.1°C | 120 | 12.6 | 13.113 h |
| May | 22.3°C12.6°C | 12.6°C | 153 | 13.7 | 14.114 h |
| June | 25.0°C17.2°C | 17.2°C | 177 | 16.5 | 14.615 h |
| July | 28.4°C21.3°C | 21.3°C | 209 | 18.7 | 14.414 h |
| August | 29.8°C22.6°C | 22.6°C | 161 | 16.3 | 13.514 h |
| September | 26.0°C19.2°C | 19.2°C | 206 | 16.2 | 12.412 h |
| October, selected | 20.5°C13.0°C | 13.0°C | 200 | 13.9 | 11.311 h |
| November | 15.2°C6.3°C | 6.3°C | 88 | 9.4 | 10.310 h |
| December | 10.0°C0.7°C | 0.7°C | 54 | 6.8 | 9.710 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
- Kazo in OctoberJapan · 13 kmHigh 20.6°C · Low 13.2°C · 196 mm rain
- Kukichūō in OctoberJapan · 13 kmHigh 20.7°C · Low 13.2°C · 190 mm rain
- Oyama in OctoberJapan · 15 kmHigh 20.2°C · Low 12.7°C · 200 mm rain
- Tatebayashi in OctoberJapan · 18 kmHigh 20.2°C · Low 12.7°C · 206 mm rain
- Sano in OctoberJapan · 19 kmHigh 20.2°C · Low 12.7°C · 206 mm rain
- Kōnosu in OctoberJapan · 22 kmHigh 20.4°C · Low 13.0°C · 196 mm rain
- Tochigi in OctoberJapan · 22 kmHigh 20.1°C · Low 12.6°C · 206 mm rain
- Kasukabe in OctoberJapan · 22 kmHigh 20.8°C · Low 13.4°C · 190 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 Koga) is explained once on the Koga year overview and on the Sources, method and limits page.
Oyama lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.