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Otaru Weather by Month
Average temperatures, rainfall and humidity for Otaru, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Otaru month looks like before you travel — then check the live Otaru forecast for the days ahead.
Warmest month
August
26°C average high
Coolest month
January
-7°C average low
Wettest month
August
128 mm of rain
Driest month
February
9 mm of rain
Average temperature and rainfall in Otaru by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 0°C | -7°C | -18°C / 13°C | 14 mm | 83% | 18 km/h |
| February | 0°C | -6°C | -19°C / 13°C | 9 mm | 81% | 18 km/h |
| March | 4°C | -2°C | -13°C / 18°C | 33 mm | 80% | 16 km/h |
| April | 10°C | 3°C | -6°C / 25°C | 74 mm | 76% | 14 km/h |
| May | 17°C | 9°C | 0°C / 31°C | 83 mm | 78% | 12 km/h |
| June | 20°C | 13°C | 6°C / 31°C | 85 mm | 84% | 11 km/h |
| July | 25°C | 18°C | 10°C / 36°C | 101 mm | 86% | 9 km/h |
| August | 26°C | 19°C | 9°C / 35°C | 128 mm | 85% | 10 km/h |
| September | 22°C | 15°C | 5°C / 33°C | 96 mm | 80% | 12 km/h |
| October | 15°C | 8°C | -2°C / 28°C | 88 mm | 81% | 16 km/h |
| November | 8°C | 2°C | -8°C / 20°C | 93 mm | 82% | 17 km/h |
| December | 2°C | -4°C | -16°C / 14°C | 36 mm | 83% | 20 km/h |
Best time to visit Otaru
The most comfortable time to visit Otaru is generally June to July and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around August, totalling about 840 mm a year.
Travellers who prefer heat should aim for August, when highs average 26°C. August is the month to avoid if rain would spoil your plans — it averages 128 mm, roughly 15× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Otaru forecast for what is happening now.
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