Charleston Area NWS Forecast
Forecast for Charleston updated at 8:27 PM on September 12, 2026
- Tonight Mostly cloudy this evening, then becoming partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 20 percent.
- Sunday Mostly sunny with a slight chance of showers and thunderstorms. Highs around 90. Southwest winds 5 to 10 mph. Chance of rain 20 percent.
- Sunday Night Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds 5 to 10 mph.
- Monday Sunny. Highs in the lower 90s. Northwest winds around 5 mph, becoming northeast in the afternoon. Heat index values up to 107.
- Monday Night Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. Southeast winds around 5 mph, increasing to northeast 10 to 15 mph with gusts up to 25 mph after midnight.
- Tuesday Mostly sunny. Highs in the mid 80s.
- Tuesday Night Mostly clear. Lows in the upper 60s.
- Wednesday Sunny. Highs in the mid 80s.
- Wednesday Night Mostly clear. Lows around 70.
- Thursday Mostly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent.
- Thursday Night Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent.
- Friday Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent.
- Friday Night Partly cloudy. Lows in the lower 70s.
- Saturday Mostly sunny with a chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 40 percent.