National Weather Service Forecast for: Clemson SC
Issued by: National Weather Service Greenville-Spartanburg, SC
Updated: 2:23 am EDT Aug 20, 2026
 
Today

Today: Mostly sunny and hot, with a high near 96. Heat index values as high as 103. Light and variable wind.
Hot

 Tonight

Tonight: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 72. Calm wind.
Slight Chance
T-storms then
Partly Cloudy
 Friday

Friday: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 93. Heat index values as high as 105. Calm wind becoming west southwest around 6 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Mostly Sunny
then Chance
T-storms
 Friday
Night
Friday Night: A 40 percent chance of showers and thunderstorms before 2am. Cloudy, then gradually becoming partly cloudy, with a low around 70. Calm wind. New rainfall amounts between a quarter and half of an inch possible.
Chance
T-storms then
Chance
Showers
 Saturday

Saturday: Mostly sunny, with a high near 92. Calm wind.
Mostly Sunny

 Saturday
Night
Saturday Night: Mostly clear, with a low around 69.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 92.
Sunny

 Sunday
Night
Sunday Night: Mostly clear, with a low around 66.
Mostly Clear

 Monday

Monday: Sunny, with a high near 90.
Sunny
Hi 96 °F Lo 72 °F Hi 93 °F Lo 70 °F Hi 92 °F Lo 69 °F Hi 92 °F Lo 66 °F Hi 90 °F

 

Today
 
 Mostly sunny and hot, with a high near 96. Heat index values as high as 103. Light and variable wind.
Tonight
 
 A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 72. Calm wind.
Friday
 
 A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 93. Heat index values as high as 105. Calm wind becoming west southwest around 6 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
 
 A 40 percent chance of showers and thunderstorms before 2am. Cloudy, then gradually becoming partly cloudy, with a low around 70. Calm wind. New rainfall amounts between a quarter and half of an inch possible.
Saturday
 
 Mostly sunny, with a high near 92. Calm wind.
Saturday Night
 
 Mostly clear, with a low around 69.
Sunday
 
 Sunny, with a high near 92.
Sunday Night
 
 Mostly clear, with a low around 66.
Monday
 
 Sunny, with a high near 90.
Monday Night
 
 Mostly clear, with a low around 68.
Tuesday
 
 Sunny, with a high near 90.
Tuesday Night
 
 Partly cloudy, with a low around 69.
Wednesday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

 

Forecast from NOAA-NWS for Clemson SC.