Iwanuma Weather in September
What's the weather like in Iwanuma (Miyagi) in September 2025?
The climate in Iwanuma during September can be summarized as warm, humid and wet.
September is in the fall / autumn in Iwanuma and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 25°C (76°F), whilst at night 17°C (63°F) is normal.
| Daytime temperature | 24.6°C 76.3°F |
|---|---|
| Nightly temperature | 17.4°C 63.3°F |
| Average temperature | 21°C 69.8°F |
| Daily sunshine | 4.5 hrs |
| Avg rainfall | 167 mm 6.6 ins |
| Rainy days | 20 days |
| Sea temperature | 23.4°C 74.2°F |
| Humidity | 80% |
| Windspeed | 7.9kph 5 mph |
On average September is the wettest month of the year in Iwanuma with around 167mm 6.6 inches of rain making it a wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 4.5 hours of sunshine per day.
September temperatures in Iwanuma
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Iwanuma in September 2025.
Other monthly averages
Best places to visit in September
Iwanuma weather stats
| Hottest month: | August | 28.6°C 83.5°F |
|---|---|---|
| Driest month: | December | 36mm 1.4ins |
| Sunniest month: | March | 6.2hrs |
| Coldest month: | January | 5.4°C 41.7°F |
| Wettest month: | September | 167mm 6.6ins |
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