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Yachiyo Weather by Month
Average temperatures, rainfall and humidity for Yachiyo, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Yachiyo month looks like before you travel — then check the live Yachiyo forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
January
2°C average low
Wettest month
June
149 mm of rain
Driest month
January
30 mm of rain
Average temperature and rainfall in Yachiyo 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 | 2°C | -5°C / 18°C | 30 mm | 58% | 15 km/h |
| February | 11°C | 3°C | -4°C / 23°C | 48 mm | 60% | 17 km/h |
| March | 15°C | 7°C | -1°C / 27°C | 87 mm | 64% | 17 km/h |
| April | 19°C | 12°C | 2°C / 28°C | 113 mm | 67% | 18 km/h |
| May | 24°C | 16°C | 7°C / 34°C | 104 mm | 71% | 17 km/h |
| June | 26°C | 20°C | 13°C / 37°C | 149 mm | 75% | 14 km/h |
| July | 31°C | 24°C | 18°C / 39°C | 107 mm | 77% | 14 km/h |
| August | 32°C | 25°C | 17°C / 39°C | 120 mm | 74% | 16 km/h |
| September | 28°C | 22°C | 13°C / 36°C | 131 mm | 77% | 15 km/h |
| October | 22°C | 16°C | 7°C / 32°C | 127 mm | 71% | 15 km/h |
| November | 17°C | 10°C | -1°C / 26°C | 65 mm | 65% | 14 km/h |
| December | 12°C | 4°C | -3°C / 23°C | 39 mm | 58% | 14 km/h |
Best time to visit Yachiyo
The most comfortable time to visit Yachiyo 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 1,119 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 149 mm, roughly 5× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Yachiyo forecast for what is happening now.
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