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CHARLESTON 7 Day Forecast

NWS Forecast for: Charleston SC Issued by: National Weather Service Charleston, SC Last Update: 8:32 am EDT Aug 20, 2026

Today High: 94 °F Sunny then Chance T-storms Tonight Low: 79 °F Mostly Clear Friday High: 93 °F Mostly Sunny then Chance T-storms Friday Night Low: 77 °F Chance T-storms Saturday High: 92 °F Slight Chance T-storms then T-storms Likely Saturday Night Low: 76 °F T-storms Likely Sunday High: 93 °F Mostly Sunny then Slight Chance T-storms Sunday Night Low: 77 °F Mostly Clear Monday High: 92 °F Sunny then Slight Chance T-storms

Heat Advisory Today: A 30 percent chance of showers and thunderstorms, mainly between 2pm and 4pm. Sunny, with a high near 94. Heat index values as high as 110. Calm wind becoming southeast 5 to 8 mph in the afternoon. Tonight: Mostly clear, with a low around 79. South wind 3 to 7 mph. Friday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Increasing clouds, with a high near 93. Heat index values as high as 108. Light southwest wind becoming south 6 to 11 mph in the afternoon. Friday Night: A 50 percent chance of showers and thunderstorms. Cloudy, then gradually becoming partly cloudy, with a low around 77. Southwest wind 5 to 9 mph. New rainfall amounts between a half and three quarters of an inch possible. Saturday: Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 92. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. Saturday Night: Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 76. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. Sunday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 93. Sunday Night: Mostly clear, with a low around 77. Monday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 92. Monday Night: A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76. Tuesday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Tuesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. Wednesday: A 40 percent chance of showers and thunderstorms. Sunny, with a high near 91.

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

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