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Iwaki Weather by Month
Average temperatures, rainfall and humidity for Iwaki, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Iwaki month looks like before you travel — then check the live Iwaki forecast for the days ahead.
Warmest month
August
30°C average high
Coolest month
February
0°C average low
Wettest month
July
132 mm of rain
Driest month
February
45 mm of rain
Average temperature and rainfall in Iwaki 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 | 7°C | 0°C | -11°C / 18°C | 65 mm | 72% | 12 km/h |
| February | 8°C | 0°C | -9°C / 21°C | 45 mm | 70% | 13 km/h |
| March | 12°C | 3°C | -5°C / 27°C | 83 mm | 71% | 13 km/h |
| April | 17°C | 8°C | -3°C / 30°C | 113 mm | 71% | 12 km/h |
| May | 22°C | 12°C | 2°C / 34°C | 100 mm | 75% | 10 km/h |
| June | 25°C | 17°C | 9°C / 37°C | 131 mm | 83% | 8 km/h |
| July | 29°C | 22°C | 13°C / 39°C | 132 mm | 85% | 8 km/h |
| August | 30°C | 23°C | 16°C / 42°C | 114 mm | 85% | 8 km/h |
| September | 26°C | 19°C | 7°C / 52°C | 123 mm | 86% | 9 km/h |
| October | 20°C | 13°C | 1°C / 36°C | 109 mm | 83% | 10 km/h |
| November | 15°C | 7°C | -6°C / 26°C | 90 mm | 78% | 10 km/h |
| December | 10°C | 2°C | -10°C / 21°C | 85 mm | 76% | 11 km/h |
Best time to visit Iwaki
The most comfortable time to visit Iwaki is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around July, totalling about 1,189 mm a year.
Travellers who prefer heat should aim for August, when highs average 30°C. July is the month to avoid if rain would spoil your plans — it averages 132 mm, roughly 3× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Iwaki forecast for what is happening now.
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