Climate averages 1991–2020
Iwamizawa weather
in July.
A warm, wet month: the 2nd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in Iwamizawa: daytime highs average 23.7°C and nights cool to about 16.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 113 mm of rain on roughly 12 days, which makes July a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 02 min on an average July day.
The nearest other city in this atlas is Ebetsu (20 km away). In July its highs average 23.4°C, about as warm as Iwamizawa, with 119 mm of rain.
Among the 303 cities listed in Japan, Iwamizawa ranks joint 292nd of 303 for the warmest July highs and 2nd of 303 for the driest July (rainfall, lowest first). The mean July high of those 303 cities is 27.9°C; Iwamizawa is 4.1°C cooler than that mean.
From July to August, average highs rise by 0.7°C to 24.4°C, and monthly rainfall rises from 113 mm to 161 mm.
The annual picture
July 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, selected | 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 | 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
July in nearby cities
- Ebetsu in JulyJapan · 20 kmHigh 23.4°C · Low 16.2°C · 119 mm rain
- Sapporo in JulyJapan · 36 kmHigh 23.8°C · Low 16.9°C · 138 mm rain
- Eniwa in JulyJapan · 37 kmHigh 22.5°C · Low 15.8°C · 119 mm rain
- Chitose in JulyJapan · 43 kmHigh 21.7°C · Low 15.9°C · 116 mm rain
- Otaru in JulyJapan · 61 kmHigh 23.5°C · Low 17.0°C · 127 mm rain
- Tomakomai in JulyJapan · 64 kmHigh 20.6°C · Low 16.1°C · 138 mm rain
- Asahikawa in JulyJapan · 80 kmHigh 23.9°C · Low 15.9°C · 147 mm rain
- Muroran in JulyJapan · 117 kmHigh 21.3°C · Low 16.7°C · 153 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.