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Aspen in September: weather & travel advice
This month's data profile
Strong month under the current formula
Aspen in September is climatically well suited to active holidays and hiking and city breaks. The average daily high is around 15 °C. With about 9 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
67/100 · #4
Warmth
#4
Dryness
#3
Sun
#6
Published best categories: Overall, City break, Active
Aspen · SeptemberPhoto: Rhododendrites · CC BY-SA 4.0Climate facts
- Average high
- 15 °C
- Average low
- 1 °C
- Rainy days (est.)
- 9 rainy days (est.)
- Sun (est.)
- 7 h/day
- Humidity
- 57 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Score |
|---|---|---|---|---|---|---|---|---|
| August | 19 | 5 | 13 | 48 | 7.4 | 59 | 0.4 | 70 |
| September (selected) | 15 | 1 | 9 | 45 | 6.5 | 57 | 0.5 | 67 |
| October | 8 | -5 | 9 | 47 | 4.9 | 63 | 0.6 | 50 |
How do the previous and next months compare?
Baseline: September (67/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | |
|---|---|---|---|---|---|---|---|---|
| August | +3 | +4.1 °C | +3.9 °C | +4.1 | +3.5 mm | +0.9 h | +2.3 % | -0.1 m/s |
| October | -17 | -7.8 °C | -5.3 °C | -0.5 | +1.9 mm | -1.6 h | +6.1 % | +0.1 m/s |
All twelve months in context
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Frequently asked questions
How warm is Aspen in September?
The average daily high is around 15 °C, with an average daily low of about 1 °C.
Does it rain a lot in Aspen in September?
The curated estimate is about 9 rainy days per month, not a directly measured long-term average. Total precipitation averages around 45 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Aspen?
By the climate score, June, July, August and September are the strongest months for Aspen. September is one of them.