Charleston Weather Blog

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

The week ahead: Heat wave peaks

/ August 16, 2026 at 10:52 PM

We have a few more days to go in the most dangerous part of this heat wave before the pattern finally begins to dislodge, allowing temperatures to trend back toward — but remain above — normal for mid-August.

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Sunday: Heat, humidity, and afternoon storms

/ August 15, 2026 at 11:21 PM

Extreme Heat Warnings look to take a break on Sunday, but that is little solace with heat indices expected to continue to peak into the lower 110s in the afternoon, well into Heat Advisory criteria. Scattered showers and thunderstorms should develop again in the afternoon along the seabreeze, and a few of those could be on the strong side given plenty of instability once again. We’ll also see a risk for flooding, especially where storms train in the same areas, courtesy of a well-saturated atmosphere. Be ready for conditions to change quickly, particularly after 3-4 PM.