UV Index in Denver, United States

Last updated: July 2, 2025

In Denver, United States, staying informed about the UV Index is crucial for maintaining skin health and preventing sunburn. With its high altitude and sunny climate, Denver experiences elevated UV levels, particularly during the midday hours when the index can peak at a notable 10. Understanding these levels empowers residents and visitors to take necessary precautions, ensuring enjoyable outdoor activities without compromising skin safety. So, whether you're hiking in the Rockies or simply enjoying a sunny afternoon in the park, being UV-aware can make all the difference in protecting your skin from harmful rays.

Hourly UV Index in Denver

The UV Index rises swiftly throughout the morning, starting from a low of 1 at 07:00 and climbing steadily to reach its peak of 10 at 13:00. As the sun reaches its zenith, the index hits 9 at 12:00, a clear reminder of the intense midday sun. After this high, the UV levels gradually decrease; by 15:00, they drop to 8 and continue to soften to 3 by 17:00, before safely settling back to a 1 at 19:00. It's essential to stay protected during those peak hours, particularly between 11:00 and 14:00, when the sun’s rays can be most dangerous. Remember to apply sunscreen and wear protective clothing to keep your skin safe while enjoying the outdoors!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
TimeUVICategoryTime to Burn
07:001low45 min
08:002low45 min
09:003moderate30 min
10:005moderate30 min
11:008very high15 min
12:009very high15 min
13:0010very high15 min
14:009very high15 min
15:008very high15 min
16:006high25 min
17:003moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Denver

Throughout the year, UV exposure varies significantly, peaking during late spring and summer months. High-risk months for UV exposure are April through September, where the UV Index frequently reaches levels classified as very high; particularly notable are May, June, and July, when it consistently hits a maximum of 10. Visitors and residents are advised to take precautions during these months, with burn times dramatically reduced to as little as 15 minutes. In contrast, January, February, and November present moderate UV levels, and December has a low index, making sun safety measures less critical during these months. To protect against skin damage, it is essential to wear sunscreen, seek shade, and wear protective clothing, especially between peak months of April and September.

Monthly Maximum UV Index for Denver, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Denver. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098642
Data source: Statistical UV Index data for Denver, based on information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Compare Denver UV Index with Other United States Cities

The table above highlights how UV exposure in Denver compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
Denver's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Denver356910101098642
Los Angeles UVI46891011111010754
Houston UVI589111112121110975