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

Tonight: Showers and possibly a thunderstorm, mainly before 5am, then a chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Patchy fog after midnight. Low around 69. Southwest wind around 9 mph becoming southeast after midnight. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain
and Patchy
Fog
 Juneteenth

Juneteenth: A chance of showers, with thunderstorms also possible after 2pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 86. West wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.
Heavy Rain
then Chance
T-storms
 Friday
Night
Friday Night: Partly cloudy, with a low around 63. North wind 5 to 7 mph.
Partly Cloudy

 Saturday

Saturday: Sunny, with a high near 83. North northeast wind around 5 mph becoming light and variable.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Sunday

Sunday: Sunny, with a high near 86.
Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 70.
Partly Cloudy

 Monday

Monday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
 Monday
Night
Monday Night: A 40 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 70.
Chance
T-storms
Lo 69 °F Hi 86 °F Lo 63 °F Hi 83 °F Lo 66 °F Hi 86 °F Lo 70 °F Hi 86 °F Lo 70 °F

 

Tonight
 
 Showers and possibly a thunderstorm, mainly before 5am, then a chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Patchy fog after midnight. Low around 69. Southwest wind around 9 mph becoming southeast after midnight. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Juneteenth
 
 A chance of showers, with thunderstorms also possible after 2pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 86. West wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
 
 Partly cloudy, with a low around 63. North wind 5 to 7 mph.
Saturday
 
 Sunny, with a high near 83. North northeast wind around 5 mph becoming light and variable.
Saturday Night
 
 Partly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm in the evening.
Sunday
 
 Sunny, with a high near 86.
Sunday Night
 
 Partly cloudy, with a low around 70.
Monday
 
 A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Monday Night
 
 A 40 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 70.
Tuesday
 
 A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 86.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Wednesday
 
 Mostly sunny, with a high near 84.
Wednesday Night
 
 Partly cloudy, with a low around 66.
Thursday
 
 Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Simpsonville SC.