October 21 is generally a great time to visit Aspen. While there is a slight chance of rain (19%), showers are usually brief. Expect comfortable 12°C weather. You'll enjoy Aspen with reasonable crowd levels and competitive accommodation options.
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Essential Travel Info for Aspen
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Aspen Weather Forecast for October 21
"Mild & Comfortable. Expect average highs of 12.3°C. 19% chance of snow."
What to Wear in Aspen in October
Based on historical data for October 21, Aspen typically experiences temperatures between -2.5°C and 12.3°C. We recommend packing heavy coat, scarf, gloves along with other layers to stay comfortable. Trends suggest it will stay mostly dry (19% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Aspen
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
- Layers (Onion System)
Average High
12.3°C
Daytime Peak
Average Low
-2.5°C
Nighttime Low
Feels Like
11.7°C
🌤️ Feels accurate
Snow Chance
19%
Avg 1mm if it snows
Snowfall
0.9 cm
~19% chance
Pressure
1018.6 hPa
Medium volatility
Aspen Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
~ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 38 min to burn
Type III-IV
🟡 57 min to burn
Type V-VI
🟢 95 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
5°C
Dry air
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
Moderate
45/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~38
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Aspen
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:24
☀️ Noon
11:53
🌇 Sunset
17:21
⏱️ Daylight
10h 57m
Wind Speed
11.6 km/h
Light breeze
Sunshine
9.4 hrs
Direct Sun (Cloud-free)
Humidity
61%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Aspen
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Aspen
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Aspen on October 21 averages 12.3°C with a 19% precipitation probability. Wedding/Outdoor Event Score: 69/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Aspen Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
October 15
13.2°C • 15% rain
Score
80
October 16
13.1°C • 14% rain
Score
80
October 17
13.2°C • 12% rain
Score
80
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (October 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Aspen Worth Visiting on October 21?
Planning a trip to Aspen on October 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 12.3°C with a 19% historical precipitation risk.
✈️ Travel Logistics: Approximately 38 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest October 21 recorded in the last 30 years saw temperatures hit 19.4°C in 2023, while the coldest dropped to -10.7°C in 2017.