Temperature
Pleasant by day, cold at night.
68°Ftypical September high
Typical range
September climate
September in Aspen
United States · North America
Mild days with cool nights and plenty of sun.
One of the best months here
Daytime high
68°F
Lows around 43°F
Precipitation
11 days/mo
Sun
11.5 h/day
Air feel
Very dry
When to visit
Month-by-month fit
Best
Precipitation
Some precipitation is expected this month.
37%wet-day frequency
Precip amountWet-day chanceSnowfall
Sunshine
Plenty of sun this month.
11.5 hSeptember sunshine
Heat & humidity by month
Very drySeptember Heat feel
Easy airWarm air
Hourly temperature pattern
In September, afternoons feel about 61° and nights feel near 39°.
FrigidFreezingVery coldColdCoolComfortableNight hours
Clear sky
Mostly clear skies this month.
64%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
4 mphSeptember Calm
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 66°F, easing to about 59°F in early evening.
Avg temp Typical range
Morning57°F
Rain14%
Cloud31%
Humid airLow
Sun intensityModerate
Best windowMidday65°F
Rain27%
Cloud42%
Humid airLow
Sun intensityStrong
Late afternoon66°F
Rain29%
Cloud51%
Humid airLow
Sun intensityStrong
Early evening59°F
Rain16%
Cloud40%
Humid airLow
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 34 | 16 | 2.3 | 12 | 8.1 | 72 |
| Feb | 36 | 18 | 2.4 | 13 | 9.1 | 70 |
| Mar | 44 | 24 | 2.7 | 13 | 10.6 | 65 |
| Apr | 49 | 29 | 3.1 | 14 | 11.7 | 64 |
| May | 57 | 35 | 2.1 | 12 | 13.1 | 64 |
| Jun | 70 | 42 | 1.2 | 8 | 13.8 | 56 |
| Jul | 78 | 50 | 2.2 | 12 | 13.4 | 59 |
| Aug | 75 | 49 | 2.6 | 14 | 12.6 | 62 |
| Sep | 68 | 43 | 1.9 | 11 | 11.5 | 59 |
| Oct | 55 | 32 | 2.2 | 10 | 10.1 | 62 |
| Nov | 43 | 19 | 2.0 | 9 | 8.8 | 68 |
| Dec | 34 | 14 | 2.4 | 11 | 7.8 | 73 |
Similar climates
Similar
Similar travel styleBad GasteinAustriaSimilar travel styleBanskoBulgariaSimilar travel styleArosaSwitzerlandSimilar travel styleAnacondaUnited States
Want a side-by-side climate view? Compare Aspen with Bad Gastein.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 7, 2026
Data & methodology