National Weather Service Forecast for: Simpsonville 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 101. Calm wind becoming south around 6 mph in the afternoon.
Hot

 Tonight

Tonight: A 20 percent chance of showers and thunderstorms, mainly between 11pm and 3am. Partly cloudy, with a low around 72. Northeast wind around 5 mph becoming calm in the evening.
Slight Chance
T-storms

 Friday

Friday: Showers and thunderstorms likely, mainly after 5pm. Increasing clouds, with a high near 92. Heat index values as high as 101. Light and variable wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Mostly Sunny
then T-storms
Likely
 Friday
Night
Friday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 69. South southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
T-storms
Likely then
Showers
Likely
 Saturday

Saturday: Mostly sunny, with a high near 90. Light and variable wind.
Mostly Sunny

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

 Sunday

Sunday: Sunny, with a high near 90.
Sunny

 Sunday
Night
Sunday Night: Mostly clear, with a low around 67.
Mostly Clear

 Monday

Monday: Sunny, with a high near 89.
Sunny
Hi 96 °F Lo 72 °F Hi 92 °F Lo 69 °F Hi 90 °F Lo 69 °F Hi 90 °F Lo 67 °F Hi 89 °F

 

Today
 
 Mostly sunny and hot, with a high near 96. Heat index values as high as 101. Calm wind becoming south around 6 mph in the afternoon.
Tonight
 
 A 20 percent chance of showers and thunderstorms, mainly between 11pm and 3am. Partly cloudy, with a low around 72. Northeast wind around 5 mph becoming calm in the evening.
Friday
 
 Showers and thunderstorms likely, mainly after 5pm. Increasing clouds, with a high near 92. Heat index values as high as 101. Light and variable wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
 
 Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 69. South southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
 
 Mostly sunny, with a high near 90. Light and variable wind.
Saturday Night
 
 Mostly clear, with a low around 69.
Sunday
 
 Sunny, with a high near 90.
Sunday Night
 
 Mostly clear, with a low around 67.
Monday
 
 Sunny, with a high near 89.
Monday Night
 
 Mostly clear, with a low around 67.
Tuesday
 
 Sunny, with a high near 89.
Tuesday Night
 
 Mostly clear, with a low around 68.
Wednesday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.

 

Forecast from NOAA-NWS for Simpsonville SC.