National Weather Service Forecast for: Clemson SC
Issued by: National Weather Service Greenville-Spartanburg, SC
Updated: 9:30 pm EDT Jun 18, 2026
 
Tonight

Tonight: Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then a chance of showers after 5am. Some of the storms could produce heavy rainfall. Patchy fog. Low around 70. South wind around 6 mph becoming east northeast after midnight. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain
and Patchy
Fog
 Juneteenth

Juneteenth: Mostly cloudy, then gradually becoming sunny, with a high near 89. West wind 5 to 7 mph.
Decreasing
Clouds

 Friday
Night
Friday Night: Partly cloudy, with a low around 64. West northwest wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Saturday

Saturday: Sunny, with a high near 85. Light and variable wind.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 67. Calm wind.
Partly Cloudy

 Sunday

Sunday: Sunny, with a high near 88.
Sunny

 Sunday
Night
Sunday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 71.
Partly Cloudy
then Chance
Showers
 Monday

Monday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Chance
Showers then
Showers
Likely
 Monday
Night
Monday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
Showers
Likely then
Chance
T-storms
Lo 70 °F Hi 89 °F Lo 64 °F Hi 85 °F Lo 67 °F Hi 88 °F Lo 71 °F Hi 87 °F Lo 71 °F

 

Tonight
 
 Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then a chance of showers after 5am. Some of the storms could produce heavy rainfall. Patchy fog. Low around 70. South wind around 6 mph becoming east northeast after midnight. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Juneteenth
 
 Mostly cloudy, then gradually becoming sunny, with a high near 89. West wind 5 to 7 mph.
Friday Night
 
 Partly cloudy, with a low around 64. West northwest wind around 5 mph becoming calm in the evening.
Saturday
 
 Sunny, with a high near 85. Light and variable wind.
Saturday Night
 
 Partly cloudy, with a low around 67. Calm wind.
Sunday
 
 Sunny, with a high near 88.
Sunday Night
 
 A 30 percent chance of showers after 2am. Partly cloudy, with a low around 71.
Monday
 
 A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Monday Night
 
 Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
Tuesday
 
 Mostly sunny, with a high near 88.
Tuesday Night
 
 Partly cloudy, with a low around 67.
Wednesday
 
 Mostly sunny, with a high near 85.
Wednesday Night
 
 Partly cloudy, with a low around 68.
Thursday
 
 Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Clemson SC.