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CHARLESTON 7 Day Forecast

NWS Forecast for: Charleston SC Issued by: National Weather Service Charleston, SC Last Update: 2:35 am EDT Aug 17, 2026

Today High: 99 °F Mostly Sunny then Slight Chance T-storms Tonight Low: 81 °F Mostly Clear Tuesday High: 100 °F Sunny then Chance T-storms Tuesday Night Low: 79 °F Chance T-storms then Mostly Clear Wednesday High: 96 °F Sunny then Slight Chance T-storms Wednesday Night Low: 80 °F Mostly Clear Thursday High: 96 °F Sunny Thursday Night Low: 80 °F Mostly Clear Friday High: 95 °F Sunny then Slight Chance T-storms

Extreme Heat Warning Extreme Heat Watch Today: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 99. Heat index values as high as 118. South wind 3 to 7 mph. Tonight: Mostly clear, with a low around 81. South wind 6 to 9 mph. Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny and hot, with a high near 100. Heat index values as high as 117. West wind around 7 mph. Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 79. Southwest wind 5 to 7 mph becoming calm in the evening. Wednesday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 96. Calm wind becoming southeast 5 to 8 mph in the afternoon. Wednesday Night: Mostly clear, with a low around 80. Thursday: Sunny, with a high near 96. Thursday Night: Mostly clear, with a low around 80. Friday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 95. Friday Night: A 30 percent chance of showers and thunderstorms, mainly between 8pm and 2am. Partly cloudy, with a low around 79. Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Saturday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77. Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

Charleston SCSimilar City Names  32.79°N 80.01°W (Elev. 10 ft)

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