A slower frontal progression from the north will allow air temperatures to head back into the mid-to-upper 90s on Sunday, prompting another round of Heat Advisories and juicing up the atmosphere for another round of strong to potentially severe thunderstorms in the afternoon and evening.
Forecast for Charleston updated at 2:53 PM on July 12, 2026
This AfternoonShowers and thunderstorms likely. Highs in the mid 90s. Heat index values up to 110. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 70 percent.
TonightMostly cloudy with a chance of thunderstorms. A chance of showers. Lows in the mid 70s. Southwest winds 5 to 10 mph with gusts up to 20 mph, becoming west after midnight. Chance of rain 50 percent.
MondayPartly sunny in the morning, then mostly cloudy with a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Northwest winds around 5 mph, becoming south in the afternoon. Chance of rain 50 percent.
Monday NightShowers with thunderstorms likely in the evening, then showers likely with a chance of thunderstorms after midnight. Lows in the lower 70s. South winds 5 to 10 mph. Chance of rain 90 percent.
TuesdayShowers likely with a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Highs in the upper 80s. Northeast winds around 5 mph, becoming southeast in the afternoon. Chance of rain 90 percent.
Tuesday NightMostly cloudy with a chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 50 percent.
WednesdayMostly sunny with a chance of thunderstorms with a slight chance of showers. Highs in the lower 90s. Chance of rain 50 percent.
Wednesday NightPartly cloudy. Lows in the mid 70s.
ThursdaySunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105.
Thursday NightMostly clear. Lows in the upper 70s. Heat index values up to 105 early in the evening.
FridaySunny with a slight chance of showers and thunderstorms. Highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110.
Friday NightMostly clear with a slight chance of showers and thunderstorms. Lows in the upper 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening.
SaturdayMostly sunny with a chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 40 percent. Heat index values up to 110.
