Peak UV index by city
| City | Population | Peak UV | Exposure | UV 3+ hours |
|---|---|---|---|---|
| Charleston | 159,423 | 4 | Moderate | 12 PM–3 PM |
| Columbia | 147,035 | 3 | Moderate | 11 AM–1 PM |
| North Charleston | 129,245 | 3 | Moderate | 1 PM–3 PM |
| Mount Pleasant | 95,469 | 4 | Moderate | 12 PM–3 PM |
| Rock Hill | 75,911 | 3 | Moderate | 11 AM–1 PM |
| Greenville | 75,310 | 1 | Low | Below 3 all day |
| Summerville | 53,177 | 3 | Moderate | 12 PM–3 PM |
| Goose Creek | 52,010 | 3 | Moderate | 1 PM–3 PM |
| Greer | 50,007 | 1 | Low | Below 3 all day |
| Sumter | 43,094 | 4 | Moderate | 11 AM–3 PM |
| Florence | 41,231 | 4 | Moderate | 11 AM–3 PM |
| Myrtle Beach | 40,937 | 4 | Moderate | 11 AM–3 PM |
| Spartanburg | 39,978 | 1 | Low | Below 3 all day |
| Fort Mill | 38,673 | 3 | Moderate | 11 AM–1 PM |
| Hilton Head Island | 38,196 | 3 | Moderate | 11 AM–3 PM |
| Bluffton | 36,807 | 3 | Moderate | 11 AM–3 PM |
| Aiken | 33,808 | 3 | Moderate | 11 AM–1 PM |
| Mauldin | 31,465 | 2 | Low | Below 3 all day |
| Anderson | 31,323 | 1 | Low | Below 3 all day |
| Conway | 30,627 | 4 | Moderate | 11 AM–3 PM |
| Simpsonville | 28,459 | 2 | Low | Below 3 all day |
| Easley | 27,319 | 1 | Low | Below 3 all day |
| North Augusta | 26,982 | 3 | Moderate | 11 AM–1 PM |
| Lexington | 25,729 | 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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