National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Shaw Air Force Base (KSSC)

Lat: 33.97°NLon: 80.48°WElev: 243ft.

Fair

76°F

24°C

Humidity 91%
Wind Speed Calm
Barometer 29.91 in (1012.7 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 20 Aug 4:55 am EDT
Extended Forecast for

Sumter SC

  • Today

    Today: Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind.

    High: 98 °F

    Hot

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 76. South wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms

  • Friday

    Friday: Showers and thunderstorms likely, mainly after 3pm. Increasing clouds and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 97 °F

    Sunny then
    T-storms
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 2am. Mostly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 73 °F

    T-storms
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 93. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 93 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 73. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

Detailed Forecast

Today
Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind.
Tonight
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 76. South wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.
Friday
Showers and thunderstorms likely, mainly after 3pm. Increasing clouds and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers and thunderstorms likely before 2am. Mostly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 93. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 73. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 72.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 71.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 93. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 93. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Sumter SC
 33.94°N 80.37°W (Elev. 180 ft)
Last Update:
2:21 am EDT Aug 20, 2026
Forecast Valid:
5am EDT Aug 20, 2026-6pm EDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation