| NWS Forecast for: Barnwell SC Issued by: National Weather Service Columbia, SC Last Update: 2:19 am EDT Jul 18, 2026 |  |
This Afternoon: A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 95. Heat index values as high as 106. Southwest wind around 6 mph. Chance of precipitation is 20%. Tonight: A chance of showers and thunderstorms, mainly before 9pm. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. Sunday: Sunny, with a high near 95. Heat index values as high as 103. Southwest wind 3 to 7 mph. Sunday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 74. Calm wind. Chance of precipitation is 20%. Monday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. Monday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 74. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. Tuesday: Mostly sunny, with a high near 94. Tuesday Night: Partly cloudy, with a low around 76. Wednesday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Chance of precipitation is 30%. Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Chance of precipitation is 50%. Thursday: A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 40%. Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 30%. Friday: A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 40%. | |
| Barnwell SC 33.23°N 81.36°W (Elev. 207 ft) | |
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