UV Index in Cheyenne, United States

Last updated: June 2, 2025

In Cheyenne, United States, staying informed about the UV Index is essential to safeguarding your skin health and preventing sunburn. Understanding the varying UV levels throughout the day helps residents and visitors make informed decisions about sun protection, especially in the high-altitude climate characteristic of Cheyenne's BSk zone. With peak UV Index readings soaring to 12 around noon, the risk of skin damage escalates significantly, making it crucial to equip yourself with knowledge and protective measures to enjoy the outdoors safely.

Hourly UV Index in Cheyenne

The UV Index demonstrates a striking rise as the day unfolds, peaking between 12:00 PM and 1:00 PM with a blistering 12. Early risers enjoy relatively low levels, starting at 1 at 7:00 AM and climbing to 2 by 8:00 AM. As the sun reaches its zenith, UV levels spike dramatically, hitting 10 at 11:00 AM and reaching peak intensity at 12:00 PM. The afternoon offers a gradual decline, with values waning to 9 by 3:00 PM and easing further to 4 at 5:00 PM. As daylight wanes, the index drops to a gentle 2 by 6:00 PM, and finally retreats to a soothing 1 by 7:00 PM, showcasing the importance of midday sun safety while enjoying outdoor activities.

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.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	2	low	45 min
09:00	4	moderate	30 min
10:00	7	high	25 min
11:00	10	very high	15 min
12:00	11	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	9	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Cheyenne

Throughout the year, the UV Index experiences notable fluctuations, with the highest risk months typically occurring from April to August. During this period, the UV Index reaches levels classified as very high to extreme, particularly peaking at 12 in June and July, which corresponds to a burn time of just 10 minutes. In contrast, the winter months of January, November, and December show a much lower UV Index, remaining in the moderate category at 4, allowing for a burn time of 30 minutes. As such, it is crucial for visitors and residents to be particularly vigilant about sun protection—especially in late spring and summer. Sunscreen, protective clothing, and seeking shade during peak hours are highly recommended to mitigate harmful effects from exposure during high UV Index periods.

Monthly Maximum UV Index for Cheyenne, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Cheyenne. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Cheyenne, 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 Cheyenne UV Index with Other United States Cities

The table above highlights how UV exposure in Cheyenne 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.

Cheyenne's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chicago UVI	3	4	6	8	9	10	10	9	8	6	4	2
Brooklyn UVI	3	5	6	8	10	10	9	9	8	6	4	2
New York City UVI	3	5	6	8	10	10	9	9	8	6	4	2
Cheyenne	4	6	7	10	10	12	12	11	9	6	4	4
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5