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Hachiōji Weather by Month
Average temperatures, rainfall and humidity for Hachiōji, Japan, month by month, built from OpenWeather's historical records. Use it to see what a typical Hachiōji month looks like before you travel — then check the live Hachiōji forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
January
0°C average low
Wettest month
June
155 mm of rain
Driest month
January
24 mm of rain
Average temperature and rainfall in Hachiōji 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 | 10°C | 0°C | -12°C / 17°C | 24 mm | 57% | 11 km/h |
| February | 11°C | 1°C | -9°C / 23°C | 42 mm | 58% | 12 km/h |
| March | 15°C | 6°C | -7°C / 27°C | 90 mm | 63% | 12 km/h |
| April | 19°C | 11°C | -3°C / 28°C | 126 mm | 66% | 12 km/h |
| May | 24°C | 15°C | 6°C / 32°C | 101 mm | 69% | 12 km/h |
| June | 26°C | 19°C | 11°C / 36°C | 155 mm | 77% | 10 km/h |
| July | 30°C | 23°C | 17°C / 38°C | 116 mm | 77% | 10 km/h |
| August | 32°C | 24°C | 18°C / 39°C | 130 mm | 76% | 11 km/h |
| September | 28°C | 21°C | 9°C / 36°C | 131 mm | 78% | 11 km/h |
| October | 22°C | 15°C | 3°C / 32°C | 123 mm | 76% | 10 km/h |
| November | 17°C | 9°C | -1°C / 25°C | 58 mm | 69% | 9 km/h |
| December | 12°C | 3°C | -9°C / 23°C | 31 mm | 60% | 10 km/h |
Best time to visit Hachiōji
The most comfortable time to visit Hachiōji is generally May to June and October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 1128 mm a year.
Travellers who prefer heat should aim for August, when highs average 32°C. June is the month to avoid if rain would spoil your plans — it averages 155 mm, roughly 6× the rainfall of January.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Hachiōji forecast for what is happening now.