CURRENTLY

81°
Feels Like 85°
Mostly Cloudy
last updated at 8:56 AM on July 21, 2024

Forecast

Forecast for Charleston updated at 6:56 AM on July 21, 2024
  • Today Partly sunny. A chance of showers and thunderstorms this afternoon. Highs in the lower 90s, except in the upper 80s near the coast. West winds around 5 mph, becoming south this afternoon. Chance of rain 40 percent.
  • Tonight Mostly cloudy with a chance of showers and thunderstorms. Lows in the mid 70s. South winds 5 to 10 mph. Chance of rain 30 percent.
  • Monday Partly sunny with a chance of showers and thunderstorms. Highs in the lower 90s, except in the upper 80s near the coast. Heat index values up to 107. Southwest winds 10 to 15 mph. Chance of rain 50 percent.
  • Monday Night Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 70s. South winds 10 to 15 mph. Chance of rain 50 percent.
  • Tuesday Mostly sunny with a chance of showers and thunderstorms. Highs in the lower 90s, except in the upper 80s near the coast. South winds 10 to 15 mph. Chance of rain 50 percent. Heat index values up to 110.
  • Tuesday Night Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 70s. Chance of rain 50 percent.
  • Wednesday Showers and thunderstorms likely. Highs in the upper 80s. Chance of rain 70 percent. Heat index values up to 105 in the afternoon.
  • Wednesday Night Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 70s. Chance of rain 50 percent.
  • Thursday Showers and thunderstorms likely. Highs in the upper 80s. Chance of rain 70 percent. Heat index values up to 105.
  • Thursday Night Mostly cloudy with a chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 50 percent.
  • Friday Showers and thunderstorms likely. Highs in the upper 80s. Chance of rain 60 percent.
  • Friday Night Mostly cloudy with a chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 50 percent.
  • Saturday Partly sunny with a chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 50 percent.

Charleston Weather Blog

Forecast explanations, atmospheric science, and other cool weather-related stuff for Charleston, SC

The week ahead: Heat, humidity, and afternoon storms continue

/ July 14, 2024 at 11:16 PM

After reaching 99° at the airport on Sunday — the warmest it’s been since May 29, 2019, when it was 101° in the midst of the Memorial Day heat wave — air temperatures make another run for the upper 90s on Monday after another steamy start in the upper 70s to low 80s as a deep-layer ridge stays in place. Given the moisture in place, heat indices should once again reach or exceed Heat Advisory criteria (108°) in many spots, especially in the Highway 17 corridor. A few showers and thunderstorms will be possible once again Monday afternoon and evening along and ahead of the seabreeze, but with the ridge in place, coverage will be scattered at best. Much like Sunday, we can’t rule out a stronger storm where one does fire if it can realize the considerable instability that will be available to it. Additionally, storm motions should again be fairly slow, and with a juicy atmosphere, some localized flooding will be possible if a storm does fire and hang out for a bit.

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