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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 18, 2026

Today High: 100 °F Sunny then Slight Chance T-storms Tonight Low: 79 °F Slight Chance T-storms then Mostly Clear Wednesday High: 98 °F Sunny Wednesday Night Low: 80 °F Mostly Clear Thursday High: 97 °F Sunny Thursday Night Low: 80 °F Mostly Clear Friday High: 96 °F Sunny Friday Night Low: 78 °F Chance T-storms Saturday High: 93 °F Slight Chance T-storms then Showers Likely

Extreme Heat Warning Today: A 20 percent chance of showers and thunderstorms after 3pm. Sunny and hot, with a high near 100. Heat index values as high as 119. West wind 6 to 8 mph. Tonight: A slight chance of showers and thunderstorms between 8pm and 9pm. Partly cloudy, with a low around 79. Southwest wind 3 to 8 mph. Chance of precipitation is 20%. Wednesday: Sunny, with a high near 98. Heat index values as high as 111. Calm wind becoming southeast 5 to 8 mph in the afternoon. Wednesday Night: Mostly clear, with a low around 80. South wind around 6 mph becoming calm in the evening. Thursday: Sunny, with a high near 97. Light south wind increasing to 5 to 10 mph in the afternoon. Thursday Night: Mostly clear, with a low around 80. Friday: Sunny, with a high near 96. Friday Night: A 40 percent chance of showers and thunderstorms, mainly before 2am. Partly cloudy, with a low around 78. Saturday: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 60%. Saturday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 77. Chance of precipitation is 60%. Sunday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. Sunday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77. Monday: A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.

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

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