Aosta Weather in September
What's the weather like in Aosta (Aosta Valley) in September 2025?
The climate in Aosta during September can be summarized as mild and a little damp.
September is in the fall / autumn in Aosta and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (58°F), whilst at night 7°C (45°F) is normal.
| Daytime temperature | 14.6°C 58.3°F |
|---|---|
| Nightly temperature | 7.4°C 45.3°F |
| Average temperature | 11°C 51.8°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 99 mm 3.9 ins |
| Rainy days | 13 days |
| Sea temperature | 21.8°C 71.3°F |
| Humidity | 76% |
| Windspeed | 10.1kph 6 mph |
On average September is the 5th wettest month of the year in Aosta with around 99mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Aosta
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 Aosta in September 2025.
Other monthly averages
Best places to visit in September
Aosta weather stats
| Hottest month: | July | 18.3°C 64.9°F |
|---|---|---|
| Driest month: | January | 80mm 3.1ins |
| Sunniest month: | July | 8.2hrs |
| Coldest month: | January | -0.3°C 31.5°F |
| Wettest month: | August | 119mm 4.7ins |
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