Sanjō Weather in September
What's the weather like in Sanjō (Niigata) in September 2025?
The climate in Sanjō during September can be summarized as warm, humid and wet.
September is in the fall / autumn in Sanjō and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 18°C (65°F) is normal.
| Daytime temperature | 26°C 78.8°F |
|---|---|
| Nightly temperature | 18.2°C 64.8°F |
| Average temperature | 22.1°C 71.8°F |
| Daily sunshine | 4.8 hrs |
| Avg rainfall | 171 mm 6.7 ins |
| Rainy days | 20 days |
| Sea temperature | 24°C 75.2°F |
| Humidity | 77% |
| Windspeed | 7.9kph 5 mph |
On average September is the 5th wettest month of the year in Sanjō with around 171mm 6.7 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 4.8 hours of sunshine per day.
September temperatures in Sanjō
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 Sanjō in September 2025.
Other monthly averages
Best places to visit in September
Sanjō weather stats
| Hottest month: | August | 30.7°C 87.3°F |
|---|---|---|
| Driest month: | April | 88mm 3.5ins |
| Sunniest month: | August | 6.9hrs |
| Coldest month: | January | 5.4°C 41.7°F |
| Wettest month: | December | 223mm 8.8ins |
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