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

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

Shaw Air Force Base (KSSC)

Lat: 33.97°NLon: 80.48°WElev: 243ft.

Mostly Cloudy

80°F

27°C

Humidity 84%
Wind Speed SW 10 mph
Barometer 29.92 in (1013.1 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 18 Jun 7:55 am EDT
Extended Forecast for

Sumter SC

  • Today

    Today: A slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 93. Heat index values as high as 101. Southwest wind 10 to 15 mph. Chance of precipitation is 20%.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 4am, then showers and possibly a thunderstorm between 4am and 5am, then showers after 5am. Patchy fog after 5am. Low around 72. South wind 5 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 72 °F

    Chance
    T-storms then
    Showers and
    Patchy Fog

  • Juneteenth

    Juneteenth: Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms after 5pm. Patchy fog before 9am. High near 88. Southwest wind 10 to 13 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 88 °F

    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 69. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 90. Northeast wind around 5 mph becoming calm in the afternoon.

    High: 90 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 40%.

    High: 93 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 93. Heat index values as high as 101. Southwest wind 10 to 15 mph. Chance of precipitation is 20%.
Tonight
Showers and thunderstorms likely before 4am, then showers and possibly a thunderstorm between 4am and 5am, then showers after 5am. Patchy fog after 5am. Low around 72. South wind 5 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Juneteenth
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms after 5pm. Patchy fog before 9am. High near 88. Southwest wind 10 to 13 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 69. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly sunny, with a high near 90. Northeast wind around 5 mph becoming calm in the afternoon.
Saturday Night
Partly cloudy, with a low around 70.
Sunday
Mostly sunny, with a high near 92.
Sunday Night
Partly cloudy, with a low around 74.
Monday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 40%.
Monday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. 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 90. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sumter SC
 33.94°N 80.4°W (Elev. 154 ft)
Last Update:
2:20 am EDT Jun 18, 2026
Forecast Valid:
8am EDT Jun 18, 2026-6pm EDT Jun 24, 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