UV Index Today in Denver, Colorado
Denver's UV Climate
Denver, located in the Rocky Mountains of Colorado, experiences a semi-arid climate with extremely high UV exposure due to its high elevation. The city's mile-high altitude, clear skies, and southern latitude result in some of the highest UV radiation levels in the United States. The combination of outdoor activities, mountain recreation, and thin atmosphere makes comprehensive sun protection critical for residents and visitors, especially during high-altitude activities.
Average Annual UV Index
8.9
Peak UV Season
April - September
Sunny Days per Year
300
Typical UV Index by Season in Denver
| Season | Typical Midday UV | Protection Needed |
|---|---|---|
| Summer | Very High to Extreme (9-11) | SPF 30+, hat, sunglasses; shade from 10 AM – 4 PM |
| Spring & Fall | High (6-8) | SPF 30+ for extended time outdoors |
| Winter | Low to Moderate (2-4) | Sunscreen for long midday exposure; more on snow |
UV Index in Nearby Cities
- UV Index in Albuquerque, NM334 mi away
- UV Index in Salt Lake City, UT371 mi away
- UV Index in Lincoln, NE443 mi away
Practical Tips for Outdoor Activities
Make the most of outdoor activities while staying safe in Denver County:
- Check UV index and weather radar before planning outdoor activities
- Schedule outdoor activities during low UV hours
- Use appropriate sun protection based on UV levels
- Stay hydrated during outdoor activities
- Take regular breaks in shaded areas
- Monitor weather conditions for changes
- Be prepared for sudden weather changes
- Know the signs of heat-related illness
- Wear a hat and protective clothing
- Check visibility conditions before outdoor plans
- Stay alert to weather alerts and warnings
UV and Weather in Denver County
Learn about Denver County's unique climate patterns, UV radiation levels, and how they affect your daily life. Enter your zip code for location-specific weather radar data and UV forecasts to help you make informed decisions about outdoor activities and sun protection.
Climate and UV Patterns
Denver's high-altitude climate creates extreme UV exposure conditions with very high to extreme UV levels for most of the year. The city receives intense UV radiation due to its elevation of 5,280 feet, which reduces atmospheric filtering of UV rays. UV index values frequently reach 10+ during peak hours, even in winter. Local weather radar shows abundant sunshine throughout the year, with minimal cloud cover providing maximum UV exposure. The thin mountain air means UV radiation is more intense than at sea level.
UV Index and Health Impact
Understanding UV radiation levels is crucial for protecting your health. Typical clear-day UV index values in Denver through the year:
- Summer: Very High to Extreme (9-11)
- Spring/Fall: High (6-8)
- Winter: Low to Moderate (2-4)
- Peak UV hours: 10 AM - 4 PM
- Cloud cover can reduce UV by 20-40%, but does not eliminate it
- Clear skies bring maximum UV exposure
Local Weather Patterns
Denver's weather patterns create unique UV exposure challenges throughout the year. The city experiences a semi-arid climate with abundant sunshine and minimal precipitation. Summer months bring hot temperatures and maximum UV exposure, while winter months bring snow and cold temperatures but still feature high UV levels due to high elevation and clear skies. The city's mountain location means UV radiation is amplified by snow reflection during winter months. Spring and fall bring variable weather but consistently high UV levels due to elevation and southern latitude.
Frequently Asked Questions About UV in Denver
What is the UV index in Denver today?
The live UV index for Denver, CO is shown at the top of this page and updates throughout the day, along with today's maximum and an hourly forecast.
When is the sun strongest in Denver?
UV radiation is strongest between 10 AM and 4 PM. Denver's peak UV season runs April - September, when the midday index typically reaches Very High to Extreme (9-11).
How high does the UV index get in Denver?
Summer days in Denver typically reach Very High to Extreme (9-11). Spring and fall usually bring High (6-8), while winter values are typically Low to Moderate (2-4).
Do I need sunscreen in Denver during winter?
It is a good idea. Winter UV in Denver still reaches moderate levels on clear days, so sunscreen is recommended for extended time outdoors.
How sunny is Denver compared to other cities?
Denver averages about 300 sunny days per year with an average annual UV index around 8.9.