National Weather Service Forecast for: Summerville SC
Issued by: National Weather Service Charleston, SC
Updated: 8:32 pm EDT Jun 18, 2026
 
Tonight

Tonight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 73. South wind 7 to 9 mph.
Chance
Showers

 Juneteenth

Juneteenth: Showers and thunderstorms likely, mainly before noon. Mostly cloudy, with a high near 88. West wind 14 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely then
Slight Chance
T-storms
 Friday
Night
Friday Night: A 30 percent chance of showers and thunderstorms, mainly between 10pm and 11pm. Mostly cloudy, with a low around 71. West wind 3 to 6 mph.
Chance
T-storms then
Mostly Cloudy
 Saturday

Saturday: Partly sunny, with a high near 91. North wind 3 to 5 mph.
Partly Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 70. Calm wind.
Partly Cloudy

 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93.
Mostly Sunny
then Slight
Chance
T-storms
 Sunday
Night
Sunday Night: Partly cloudy, with a low around 73.
Partly Cloudy

 Monday

Monday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94.
Mostly Sunny
then Chance
T-storms
 Monday
Night
Monday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 75.
Chance
T-storms
Lo 73 °F Hi 88 °F Lo 71 °F Hi 91 °F Lo 70 °F Hi 93 °F Lo 73 °F Hi 94 °F Lo 75 °F

 

Tonight
 
 A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 73. South wind 7 to 9 mph.
Juneteenth
 
 Showers and thunderstorms likely, mainly before noon. Mostly cloudy, with a high near 88. West wind 14 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
 
 A 30 percent chance of showers and thunderstorms, mainly between 10pm and 11pm. Mostly cloudy, with a low around 71. West wind 3 to 6 mph.
Saturday
 
 Partly sunny, with a high near 91. North wind 3 to 5 mph.
Saturday Night
 
 Partly cloudy, with a low around 70. Calm wind.
Sunday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93.
Sunday Night
 
 Partly cloudy, with a low around 73.
Monday
 
 A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94.
Monday Night
 
 A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 75.
Tuesday
 
 A 50 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Wednesday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Thursday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.

 

Forecast from NOAA-NWS for Summerville SC.