UV Index in Charleston, United States

Last updated: June 2, 2025

In Charleston, United States, being aware of the UV Index is crucial for protecting your skin and overall health. As temperatures rise, understanding the levels of UV exposure helps in preventing sunburn and mitigating long-term skin damage. Charleston's humid subtropical climate often means elevated UV levels, with peaks reaching a staggering 11 around midday. By staying informed and taking appropriate precautions, you can enjoy the beautiful South Carolina sun while safeguarding your skin against harmful effects.

Hourly UV Index in Charleston

The UV Index steadily climbs as the day progresses, starting from a mild 1 at 7:00 AM and reaching a peak of 11 by 1:00 PM. Sun-seekers and outdoor enthusiasts should be mindful, as the index hits a high of 10 at 12:00 PM, signaling significant UV exposure. After this peak, the index gradually decreases, dropping to 8 by 3:00 PM, and continuing to decline to 1 by 7:00 PM. For safe sun enjoyment, it’s best to take precautions during those high UV hours, particularly between 11:00 AM and 2:00 PM. Remember to sport your hats and sunscreen!

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
09:004moderate30 min
10:006high25 min
11:009very high15 min
12:0010very high15 min
13:0011extreme10 min
14:0010very high15 min
15:008very high15 min
16:006high25 min
17:003moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Charleston

The UV Index experiences significant seasonal variation, peaking in the spring and summer months. From April to September, the UV Index reaches very high levels, particularly in May and June, when it hits an extreme rating of 11. The high-risk months for UV exposure are April through September, with the lowest burn time of just 10 minutes occurring in May and June. As such, it's crucial for visitors and residents to take precautions during these months by wearing protective clothing, applying sunscreen regularly, and seeking shade, especially between 10 AM and 4 PM. In the fall and winter, the UV Index decreases to moderate levels, with safer exposure times returning. However, awareness is still essential year-round to prevent skin damage.

Monthly Maximum UV Index for Charleston, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Charleston. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec36710111110109753
Data source: Statistical UV Index data for Charleston, 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 Charleston UV Index with Other United States Cities

The table above highlights how UV exposure in Charleston 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.
Charleston'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
Charleston36710111110109753
Los Angeles UVI46891011111010754
Houston UVI589111112121110975