Climate averages 1991–2020
Iwamizawa weather
in June.
A mild, moderately wet month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a mild month in Iwamizawa: daytime highs average 20.1°C and nights cool to about 11.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 64 mm of rain on roughly 10 days, which makes June a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 19 min on an average June day.
The nearest other city in this atlas is Ebetsu (20 km away). In June its highs average 19.7°C, about as warm as Iwamizawa, with 76 mm of rain.
Among the 303 cities listed in Japan, Iwamizawa ranks joint 292nd of 303 for the warmest June highs and 1st of 303 for the driest June (rainfall, lowest first). The mean June high of those 303 cities is 24.4°C; Iwamizawa is 4.3°C cooler than that mean.
From June to July, average highs rise by 3.6°C to 23.7°C, and monthly rainfall rises from 64 mm to 113 mm.
The annual picture
June 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, selected | 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 | 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
June in nearby cities
- Ebetsu in JuneJapan · 20 kmHigh 19.7°C · Low 11.7°C · 76 mm rain
- Sapporo in JuneJapan · 36 kmHigh 20.1°C · Low 12.2°C · 89 mm rain
- Eniwa in JuneJapan · 37 kmHigh 18.8°C · Low 11.2°C · 76 mm rain
- Chitose in JuneJapan · 43 kmHigh 17.9°C · Low 11.4°C · 77 mm rain
- Otaru in JuneJapan · 61 kmHigh 19.6°C · Low 12.2°C · 76 mm rain
- Tomakomai in JuneJapan · 64 kmHigh 16.7°C · Low 11.6°C · 100 mm rain
- Asahikawa in JuneJapan · 80 kmHigh 20.4°C · Low 11.3°C · 90 mm rain
- Muroran in JuneJapan · 117 kmHigh 17.4°C · Low 12.2°C · 104 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.