The climate in Sendai during September can be summarized as warm, humid and wet.
September is in the fall / autumn in Sendai 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||24.5°C 76°F|
|Nightly temperature||17.4°C 63.2°F|
|Average temperature||20.9°C 69.6°F|
|Daily sunshine||4.6 hrs|
|Avg rainfall||174 mm 6.9 ins|
|Rainy days||20 days|
|Sea temperature||23.4°C 74.2°F|
|Windspeed||7.9kph 5 mph|
On average September is the wettest month of the year in Sendai with around 174mm 6.9 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 4.6 hours of sunshine per day.
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 Sendai in September 2023.
|Hottest month:||August||28.3°C 82.9°F|
|Driest month:||December||38mm 1.5ins|
|Coldest month:||January||5.1°C 41.2°F|
|Wettest month:||September||174mm 6.9ins|