May 18 is generally a great time to visit Denver. While there is a slight chance of rain (26%), showers are usually brief. Expect comfortable 21°C weather. As it's peak season for Denver, we recommend booking your stay well in advance to secure the best rates.
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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 May 18
"Mild & Comfortable. Expect average highs of 21.1°C. 26% chance of snow."
What to Wear in Denver in May
Based on historical data for May 18, Denver typically experiences temperatures between 6.5°C and 21.1°C. We recommend packing light jacket, long pants, layers (onion system) to stay comfortable. With a 26% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Denver
Smart Suitcase
- Light Jacket
- Long Pants
- Layers (Onion System)
Average High
21.1°C
Daytime Peak
Average Low
6.5°C
Nighttime Low
Feels Like
21.2°C
☀️ Feels accurate
Snow Chance
26%
Avg 1.8mm if it snows
Snowfall
0.2 cm
~26% chance
Pressure
1010.7 hPa
Medium volatility
Denver Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
❓ Expect variable conditions. Have flexible plans and pack for multiple weather scenarios.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
04:00 - 10:00
16:00 - 19:00
Type I-II
🔴 13 min to burn
Type III-IV
🟡 20 min to burn
Type V-VI
🟢 33 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
12.5°C
Pleasant
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
97/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~1,126
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Denver
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:44
☀️ Noon
11:57
🌇 Sunset
19:11
⏱️ Daylight
14h 27m
Wind Speed
15.5 km/h
Gentle breeze
Sunshine
11.0 hrs
Direct Sun (Cloud-free)
Humidity
58%
Comfortable
Travel Intelligence
Exclusive flight analytics & health data for Denver
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Denver
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
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 May 18 averages 21.1°C with a 26% precipitation probability. Wedding/Outdoor Event Score: 91/100."
— 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
May 15
21.2°C • 20% rain
Score
92
May 16
21.1°C • 23% rain
Score
92
May 17
21.2°C • 23% rain
Score
92
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 18) in other destinations
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📍 Is Denver Worth Visiting on May 18?
Planning a trip to Denver on May 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 21.1°C with a 26% historical precipitation risk.
✈️ Travel Logistics: Approximately 1,126 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest May 18 recorded in the last 30 years saw temperatures hit 29.3°C in 2020, while the coldest dropped to 0.8°C in 2017.