National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 33.23°N 81.36°W (Text-Only)
NWS Forecast for: Barnwell SC
Issued by: National Weather Service Columbia, SC
Last Update: 2:21 am EDT Aug 7, 2026		Print

  • Today

    Today: A chance of showers and thunderstorms, mainly between 2pm and 5pm. Areas of fog before 10am. Otherwise, mostly sunny, with a high near 33. Heat index values as high as 38. Calm wind. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    High: 33 °C

    Areas Fog
    then Chance
    T-storms


  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 22. Calm wind.

    Low: 22 °C

    Partly Cloudy
    then Patchy
    Fog


  • Saturday

    Saturday: A chance of showers between 10am and 11am, then a chance of showers and thunderstorms after 11am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 32. Calm wind becoming southeast 5 to 8 km/h in the afternoon. Chance of precipitation is 50%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 32 °C

    Chance
    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Saturday
    Night

    Saturday Night: A slight chance of showers after 2am. Partly cloudy, with a low around 22. Calm wind. Chance of precipitation is 20%.

    Low: 22 °C

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 34. Calm wind. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    High: 34 °C

    Partly Sunny
    then Chance
    T-storms


  • Sunday
    Night

    Sunday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 23. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    Low: 23 °C

    Chance
    T-storms then
    Slight Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 34. Chance of precipitation is 30%.

    High: 34 °C

    Mostly Sunny
    then Chance
    T-storms


  • Monday
    Night

    Monday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 23. Chance of precipitation is 30%.

    Low: 23 °C

    Chance
    T-storms then
    Partly Cloudy


  • Tuesday

    Tuesday: Mostly sunny, with a high near 35.

    High: 35 °C

    Mostly Sunny






    • Today: A chance of showers and thunderstorms, mainly between 2pm and 5pm. Areas of fog before 10am. Otherwise, mostly sunny, with a high near 33. Heat index values as high as 38. Calm wind. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    Tonight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 22. Calm wind.

    Saturday: A chance of showers between 10am and 11am, then a chance of showers and thunderstorms after 11am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 32. Calm wind becoming southeast 5 to 8 km/h in the afternoon. Chance of precipitation is 50%. New rainfall amounts between 2.5 and 5 mm possible.

    Saturday Night: A slight chance of showers after 2am. Partly cloudy, with a low around 22. Calm wind. Chance of precipitation is 20%.

    Sunday: A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 34. Calm wind. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    Sunday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 23. Chance of precipitation is 30%. New precipitation amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    Monday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 34. Chance of precipitation is 30%.

    Monday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 23. Chance of precipitation is 30%.

    Tuesday: Mostly sunny, with a high near 35.

    Tuesday Night: Partly cloudy, with a low around 24.

    Wednesday: Sunny, with a high near 35.

    Wednesday Night: Partly cloudy, with a low around 24.

    Thursday: Sunny, with a high near 35.


    Barnwell SC
     33.23°N 81.36°W (Elev. 207 m)

    Visit your local NWS office at: https://www.weather.gov/cae/