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

98°F

37°C

Humidity 35%
Wind Speed NW 5 mph
Barometer 29.89 in (1012.0 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 19 Aug 5:55 pm EDT
Extended Forecast for

Sumter SC

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 75. Light and variable wind. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 99. Heat index values as high as 107. Calm wind.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 76. South wind around 5 mph becoming calm after midnight.

    Low: 76 °F

    Mostly Clear

  • Friday

    Friday: Showers likely and possibly a thunderstorm between 2pm and 5pm, then showers and thunderstorms likely after 5pm. Increasing clouds and hot, with a high near 98. Heat index values as high as 109. Light south wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 98 °F

    Sunny then
    T-storms
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am. Mostly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 73 °F

    T-storms
    Likely then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 93. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 93 °F

    Mostly Sunny
    then Showers
    Likely

  • Saturday Night

    Saturday 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 72. Chance of precipitation is 60%.

    Low: 72 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 75. Light and variable wind. Chance of precipitation is 20%.
Thursday
Mostly sunny and hot, with a high near 99. Heat index values as high as 107. Calm wind.
Thursday Night
Mostly clear, with a low around 76. South wind around 5 mph becoming calm after midnight.
Friday
Showers likely and possibly a thunderstorm between 2pm and 5pm, then showers and thunderstorms likely after 5pm. Increasing clouds and hot, with a high near 98. Heat index values as high as 109. Light south wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am. Mostly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 93. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday 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 72. Chance of precipitation is 60%.
Sunday
Mostly sunny, with a high near 94.
Sunday Night
Partly cloudy, with a low around 72.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 72.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 94. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 94. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Sumter SC
 33.94°N 80.4°W (Elev. 154 ft)
Last Update:
2:21 pm EDT Aug 19, 2026
Forecast Valid:
6pm EDT Aug 19, 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