Peak UV index by city
| City | Population | Peak UV | Exposure | UV 3+ hours |
|---|---|---|---|---|
| Cheyenne | 66,507 | 3 | Moderate | 12 PM–1 PM |
| Casper | 58,771 | 2 | Low | Below 3 all day |
| Gillette | 34,024 | 2 | Low | Below 3 all day |
| Laramie | 32,284 | 3 | Moderate | 11 AM–1 PM |
UV 3+ hours show the window from the first forecast hour at 3 or above to the end of the last. The EPA recommends sun protection at UV 3 and above. Open a city for its current-hour forecast and hourly chart. Forecast sources and limitations.
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