March 21 is statistically one of the best days of the year in Denver. With minimal rain risk (11%) and pleasant highs of 12°C, it's ideal for outdoor adventures. Denver is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Denver
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Denver Weather Forecast for March 21
"Mild & Comfortable. Expect average highs of 11.9°C. 11% chance of snow."
What to Wear in Denver in March
Based on historical data for March 21, Denver typically experiences temperatures between -4.1°C and 11.9°C. We recommend packing heavy coat, scarf, gloves along with other layers to stay comfortable. Trends suggest it will stay mostly dry (11% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Denver
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
- Layers (Onion System)
Average High
11.9°C
Daytime Peak
Average Low
-4.1°C
Nighttime Low
Feels Like
11°C
🌤️ Feels accurate
Snow Chance
11%
Avg 0.6mm if it snows
Snowfall
0.8 cm
~11% chance
Pressure
1014.8 hPa
Medium volatility
Denver 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 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 22 min to burn
Type III-IV
🟡 33 min to burn
Type V-VI
🟢 55 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
3.4°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
High
89/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~1,032
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Denver
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:03
☀️ Noon
12:08
🌇 Sunset
18:13
⏱️ Daylight
12h 10m
Wind Speed
14.9 km/h
Gentle breeze
Sunshine
10.0 hrs
Direct Sun (Cloud-free)
Humidity
56%
Comfortable
Travel Intelligence
Exclusive flight analytics & health data for Denver
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 Denver
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟢 Moderate
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
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Denver on March 21 averages 11.9°C with a 11% precipitation probability. Wedding/Outdoor Event Score: 72/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Denver Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
March 25
12.6°C • 15% rain
Score
75
March 22
12.3°C • 14% rain
Score
74
March 23
12.2°C • 15% rain
Score
74
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (March 21) in other destinations
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📍 Is Denver Worth Visiting on March 21?
Planning a trip to Denver on March 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 11.9°C with a 11% historical precipitation risk.
✈️ Travel Logistics: Approximately 1,032 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest March 21 recorded in the last 30 years saw temperatures hit 22°C in 2017, while the coldest dropped to -13.6°C in 2020.