National Weather Service Forecast for: Summerville SC
Issued by: National Weather Service Charleston, SC
Updated: 4:48 am EDT Jun 22, 2026
 
Today

Today: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 94. West wind 5 to 9 mph.
Mostly Sunny
then Slight
Chance
T-storms
 Tonight

Tonight: Mostly clear, with a low around 77. Southwest wind around 8 mph.
Mostly Clear

 Tuesday

Tuesday: A 40 percent chance of showers and thunderstorms, mainly between 2pm and 3pm. Sunny, with a high near 94. Heat index values as high as 102. West wind around 11 mph, with gusts as high as 21 mph.
Sunny then
Chance
T-storms
 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 72. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Chance
T-storms then
Slight Chance
Showers
 Wednesday

Wednesday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 92. Light north wind.
Mostly Sunny
then Chance
T-storms
 Wednesday
Night
Wednesday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 73.
Chance
T-storms then
Mostly Clear
 Thursday

Thursday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 92.
Chance
T-storms

 Thursday
Night
Thursday Night: A 30 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 74.
Chance
T-storms

 Friday

Friday: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 94.
Chance
T-storms
Hi 94 °F Lo 77 °F Hi 94 °F Lo 72 °F Hi 92 °F Lo 73 °F Hi 92 °F Lo 74 °F Hi 94 °F

 

Today
 
 A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 94. West wind 5 to 9 mph.
Tonight
 
 Mostly clear, with a low around 77. Southwest wind around 8 mph.
Tuesday
 
 A 40 percent chance of showers and thunderstorms, mainly between 2pm and 3pm. Sunny, with a high near 94. Heat index values as high as 102. West wind around 11 mph, with gusts as high as 21 mph.
Tuesday Night
 
 A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 72. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Wednesday
 
 A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 92. Light north wind.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 73.
Thursday
 
 A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 92.
Thursday Night
 
 A 30 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 74.
Friday
 
 A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 94.
Friday Night
 
 A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 75.
Saturday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Saturday Night
 
 Partly cloudy, with a low around 76.
Sunday
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 98.

 

Forecast from NOAA-NWS for Summerville SC.