The weather in Aspen in September is very cold with temperatures between 0°C and 18°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Aspen. 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.
Aspen is going to experience quite a number of days of snow during September. It’s the perfect time to build snowmen, drink hot cocoa, and have a snowball fight. Just remember to wear a warm scarf and a pair of mittens!
Our weather forecast can give you a great sense of what weather to expect in Aspen in September 2025.
If you’re planning to visit Aspen in the near future, we highly recommend that you review the 14 day weather forecast for Aspen before you arrive.
