Places › Aspen, CO › September

Aspen in September

One of the best months — score 92 of 100

Typical September days in Aspen reach about 67°F with nights near 40°F.

What to pack for Aspen in September

• A warm jacket for evenings and early starts.
• Layers — afternoons run about 27° warmer than mornings.
• A waterproof shell — rain falls on about 10 days in a typical September.
• Warm, waterproof boots for slush and snow days.

Every packing line is triggered by a number on this page — the rules are on How we pick.

September vs. the alternatives

The whole year in Aspen

Averages are the 1991–2020 climate normals (NOAA National Centers for Environmental Information) for the station named on each page. Rain days = days with at least 0.01 in of precipitation. Daylight is computed for the middle of the month.