Climate averages 1991–2020
Otaru weather
in August.
A warm, wet month: the warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Otaru: daytime highs average 24.4°C and nights cool to about 18.8°C. By daytime temperature it is the warmest month of the year.
Expect about 163 mm of rain on roughly 14 days, which makes August a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 57 min on an average August day.
The nearest other city in this atlas is Sapporo (31 km away). In August its highs average 24.6°C, about as warm as Otaru, with 191 mm of rain.
Among the 303 cities listed in Japan, Otaru ranks joint 292nd of 303 for the warmest August highs and joint 200th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Otaru is 4.7°C cooler than that mean.
From August to September, average highs fall by 3.7°C to 20.8°C, and monthly rainfall falls from 163 mm to 149 mm.
The annual picture
August 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
Otaru climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.3°C-5.8°C | -5.8°C | 98 | 20.8 | 9.49 h |
| February | -1.6°C-5.7°C | -5.7°C | 80 | 18.2 | 10.510 h |
| March | 1.8°C-3.0°C | -3.0°C | 76 | 15.0 | 11.912 h |
| April | 7.3°C1.4°C | 1.4°C | 66 | 11.2 | 13.413 h |
| May | 15.1°C7.0°C | 7.0°C | 84 | 11.7 | 14.615 h |
| June | 19.6°C12.2°C | 12.2°C | 76 | 10.6 | 15.315 h |
| July | 23.5°C17.0°C | 17.0°C | 127 | 12.8 | 15.015 h |
| August, selected | 24.4°C18.8°C | 18.8°C | 163 | 14.1 | 14.014 h |
| September | 20.8°C15.3°C | 15.3°C | 149 | 13.9 | 12.513 h |
| October | 14.4°C9.0°C | 9.0°C | 117 | 14.9 | 11.111 h |
| November | 6.8°C2.3°C | 2.3°C | 129 | 18.6 | 9.810 h |
| December | 0.3°C-2.7°C | -2.7°C | 125 | 21.9 | 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
August in nearby cities
- Sapporo in AugustJapan · 31 kmHigh 24.6°C · Low 18.5°C · 191 mm rain
- Ebetsu in AugustJapan · 45 kmHigh 24.1°C · Low 17.6°C · 171 mm rain
- Eniwa in AugustJapan · 57 kmHigh 23.6°C · Low 17.4°C · 171 mm rain
- Iwamizawa in AugustJapan · 61 kmHigh 24.4°C · Low 17.5°C · 161 mm rain
- Chitose in AugustJapan · 67 kmHigh 23.2°C · Low 17.8°C · 162 mm rain
- Tomakomai in AugustJapan · 79 kmHigh 22.5°C · Low 18.2°C · 197 mm rain
- Muroran in AugustJapan · 97 kmHigh 23.0°C · Low 18.7°C · 181 mm rain
- Asahikawa in AugustJapan · 128 kmHigh 24.1°C · Low 16.5°C · 171 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 Otaru) is explained once on the Otaru year overview and on the Sources, method and limits page.