NWS Forecast for Summerville SC

National Weather Service Forecast for: Summerville SC
Issued by: National Weather Service Charleston, SC

Updated: 2:45 pm EDT Jul 28, 2026

Tonight Partly Cloudy then Slight Chance T-storms	Wednesday Mostly Sunny	Wednesday Night Mostly Clear	Thursday Sunny	Thursday Night Mostly Clear	Friday Sunny	Friday Night Partly Cloudy	Saturday Chance T-storms	Saturday Night Chance T-storms
Lo 77 °F	Hi 95 °F	Lo 73 °F	Hi 93 °F	Lo 71 °F	Hi 94 °F	Lo 75 °F	Hi 93 °F	Lo 75 °F

Heat Advisory

Tonight	A 20 percent chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 77. Southwest wind 6 to 8 mph.
Wednesday	Mostly sunny, with a high near 95. Heat index values as high as 102. Northwest wind around 6 mph.
Wednesday Night	Mostly clear, with a low around 73. Calm wind.
Thursday	Sunny, with a high near 93. North wind 5 to 7 mph.
Thursday Night	Mostly clear, with a low around 71. Calm wind.
Friday	Sunny, with a high near 94.
Friday Night	Partly cloudy, with a low around 75.
Saturday	A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 93.
Saturday Night	A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.
Sunday	A chance of showers, then showers and thunderstorms likely after 8am. Partly sunny, with a high near 90. Chance of precipitation is 60%.
Sunday Night	Showers and thunderstorms likely. Mostly cloudy, with a low around 75. Chance of precipitation is 60%.
Monday	Showers and thunderstorms likely. Partly sunny, with a high near 91. Chance of precipitation is 60%.
Monday Night	Showers and thunderstorms likely. Mostly cloudy, with a low around 75. Chance of precipitation is 60%.
Tuesday	A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

Forecast from NOAA-NWS for Summerville SC.