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Aspen Weather in September
September in Aspen sees daytime temperatures around 19°C (66°F) and lows of 4°C (39°F) at night. Pack a rain jacket because some rainfall is likely.
Rainfall in Aspen in September
Typically around 12 days of rainfall are expected, averaging 47 mm (1.9 in) for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Aspen in September
Aspen in September gets highs of 19°C (66°F) during the day and drops to 4°C (39°F) at night. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. At 4°C (39°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Aspen.
Aspen Temperature in September
Min Temperature
4°C (39°F)
Max Temperature
19°C (66°F)
Chance of Rain
39%
Precipitation
47 mm (1.9 in)
Rainy days
12 days
Humidity
51%
Aspen Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Aspen - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Aspen in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days.
What To Do in Aspen in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Camping5/10 -
Outdoor sports10/10
Aspen 3-Day Forecast
More climate data for Aspen
See the full Aspen climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
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