Climate averages 1991–2020
Iwamizawa weather
in October.
A cool, wet month: the 6th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a cool month in Iwamizawa: daytime highs average 14.4°C and nights cool to about 6.3°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 92 mm of rain on roughly 14 days, which makes October a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 04 min on an average October day.
The nearest other city in this atlas is Ebetsu (20 km away). In October its highs average 14.3°C, about as warm as Iwamizawa, with 87 mm of rain.
Among the 303 cities listed in Japan, Iwamizawa ranks joint 295th of 303 for the warmest October highs and 5th of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Iwamizawa is 5.9°C cooler than that mean.
From October to November, average highs fall by 7.8°C to 6.7°C, and monthly rainfall falls from 92 mm to 87 mm.
The annual picture
October in context
Monthly precipitation
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
Iwamizawa climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -3.5°C-10.8°C | -10.8°C | 49 | 12.9 | 9.49 h |
| February | -2.5°C-10.0°C | -10.0°C | 43 | 10.8 | 10.510 h |
| March | 1.9°C-5.9°C | -5.9°C | 57 | 11.6 | 11.912 h |
| April | 9.5°C0.1°C | 0.1°C | 67 | 11.8 | 13.413 h |
| May | 16.2°C6.8°C | 6.8°C | 83 | 11.4 | 14.615 h |
| June | 20.1°C11.8°C | 11.8°C | 64 | 9.6 | 15.315 h |
| July | 23.7°C16.3°C | 16.3°C | 113 | 11.5 | 15.015 h |
| August | 24.4°C17.5°C | 17.5°C | 161 | 12.5 | 14.014 h |
| September | 20.8°C13.1°C | 13.1°C | 126 | 13.2 | 12.513 h |
| October, selected | 14.4°C6.3°C | 6.3°C | 92 | 13.6 | 11.111 h |
| November | 6.7°C-0.5°C | -0.5°C | 87 | 16.1 | 9.810 h |
| December | -0.8°C-8.0°C | -8.0°C | 69 | 15.3 | 9.19 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Ebetsu in OctoberJapan · 20 kmHigh 14.3°C · Low 6.7°C · 87 mm rain
- Sapporo in OctoberJapan · 36 kmHigh 14.7°C · Low 8.0°C · 99 mm rain
- Eniwa in OctoberJapan · 37 kmHigh 14.3°C · Low 6.8°C · 87 mm rain
- Chitose in OctoberJapan · 43 kmHigh 14.5°C · Low 7.6°C · 91 mm rain
- Otaru in OctoberJapan · 61 kmHigh 14.4°C · Low 9.0°C · 117 mm rain
- Tomakomai in OctoberJapan · 64 kmHigh 14.3°C · Low 8.8°C · 110 mm rain
- Asahikawa in OctoberJapan · 80 kmHigh 13.0°C · Low 4.6°C · 115 mm rain
- Muroran in OctoberJapan · 117 kmHigh 14.1°C · Low 8.9°C · 103 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 Iwamizawa) is explained once on the Iwamizawa year overview and on the Sources, method and limits page.