The weather in Aosta in September is very cold with temperatures between 0°C and 13°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Aosta. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
You can expect a few days of snow in Aosta during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Aosta.
Our weather forecast can give you a great sense of what weather to expect in Aosta in September 2025.
If you’re planning to visit Aosta in the near future, we highly recommend that you review the 14 day weather forecast for Aosta before you arrive.
Temperatures
13° / 0°
Rainy Days
12
Snowy Days
3
Dry Days
16
Rainfall
129
mm
Sun Hours
9.9
Hrs
