The climate in Nikkō during September can be summarized as mild and very wet.
September is in the fall / autumn in Nikkō and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 12°C (54°F) is normal.
|Daytime temperature||20°C 68°F|
|Nightly temperature||12.4°C 54.3°F|
|Average temperature||16.2°C 61.2°F|
|Daily sunshine||3.9 hrs|
|Avg rainfall||285 mm 11.2 ins|
|Rainy days||22 days|
|Sea temperature||25°C 77°F|
|Windspeed||7.9kph 5 mph|
On average September is the 2nd wettest month of the year in Nikkō with around 285mm 11.2 inches of rain making it a very wet time to visit. This rainfall is typically spread over 22 days, although this may vary considerably.
On the flip side this corresponds to an average of 3.9 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 Nikkō in September 2023.
|Hottest month:||August||24.5°C 76.1°F|
|Driest month:||December||41mm 1.6ins|
|Coldest month:||January||0.9°C 33.6°F|
|Wettest month:||August||318mm 12.5ins|