Charleston Weather Blog

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

Thursday: Heat index approaches 110° across the metro before storms move in

/ July 19, 2023 at 10:10 PM

Thursday is going to be another hot day across the area. Expect to start the day just barely below 80° inland and likely a couple degrees above it closer to the coast. We’ll warm back into the mid-90s during the day, and with dewpoints not mixing out quite as much — expect them to hang around in the mid-70s — we should see heat indices peak around 110° or so in the afternoon. This is certainly well into the danger zone for heat illness, so please do take it easy if you must be outside. There’s no Heat Advisory as of this writing, but don’t be surprised if one is issued by morning.

Attention then turns to the potential for showers and thunderstorms to move into the area in the afternoon and evening courtesy of a disturbance rounding a retreating ridge of high pressure. Most of these storms should be efficient rainfall and lightning producers, and a few of these storms could be on the strong side with damaging wind gusts the main concern. Hail can’t be ruled out, either. Stay alert to rapidly changing conditions as we get into tomorrow afternoon and evening, and don’t be surprised if there are evening commute impacts.

Fortunately, wildfire smoke will play much less of a role in Thursday’s weather as it continues to disperse southward.

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