Charleston Area NWS Forecast
Forecast for Charleston updated at 10:02 AM on July 23, 2026
- Rest Of Today Mostly sunny. Highs in the mid 90s, except in the lower 90s near the coast. Heat index values up to 107. Southwest winds 10 to 15 mph.
- Tonight Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph with gusts up to 20 mph.
- Friday Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 90s, except in the upper 80s near the coast. Heat index values up to 106. South winds 5 to 10 mph. Chance of rain 50 percent.
- Friday Night Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 70s. South winds 5 to 10 mph. Chance of rain 50 percent.
- Saturday A chance of showers and thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs around 90. Southwest winds 5 to 10 mph. Chance of rain 90 percent. Heat index values up to 107.
- Saturday Night Showers likely with a chance of thunderstorms. Lows in the mid 70s. Chance of rain 70 percent.
- Sunday Showers and thunderstorms likely. Highs in the lower 90s. Chance of rain 70 percent. Heat index values up to 105.
- Sunday Night Partly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 20 percent.
- Monday Sunny. Highs in the lower 90s.
- Monday Night Mostly clear. Lows in the upper 70s.
- Tuesday Sunny. Highs in the lower 90s. Heat index values up to 105.
- Tuesday Night Mostly clear. Lows around 80. Heat index values up to 105 early in the evening.
- Wednesday Mostly sunny with a chance of showers and thunderstorms. Highs in the mid 90s. Chance of rain 30 percent. Heat index values up to 110.