Labor Day weekend will get off to a hot start with Heat Advisory-level heat indices expected Saturday. From there, we’ll turn more unsettled as we get into Sunday as a front moves through the area.

Hot and humid conditions will peak on Saturday as air temperatures head to the mid-90s in the afternoon under mostly sunny skies. Mixing in mid-70s and higher dewpoints will drive heat indices upwards of 108-110° in the afternoon, especially as the seabreeze pushes inland. This will get us a late-season Heat Advisory across the Tri-County from 11am-8pm, so be sure you’re getting plenty of water if you are out and about during the height of the day Saturday.

As we get into Saturday night and Sunday, a front will push across the area, bringing about an elevated risk for showers and thunderstorms. A first round of showers and storms will approach the area late Saturday night; while they will be losing punch with diminishing daytime heating, a strong wind gust or two can’t be ruled out as the storms push across the area.

We should start Sunday generally quiet, but thunderstorm chances return perhaps by late morning. A few of these thunderstorms could become severe with damaging wind gusts. There is also an elevated risk for flooding given deep moisture across the area and plenty of available instability to help wring it out. It won’t be a washout, but you’ll want indoor plans. Temperatures start in the mid-70s, and should peak in the low-to-mid-90s before storms really get going.

We’ll keep shower and thunderstorm chances in play for Labor Day, but temperatures will run a little cooler as high pressure wedges in from the northeast. This will also increase the risk for coastal flooding in the 4-7pm timeframe, so be ready for roads to close downtown as water levels should head solidly into minor flood stage.

Follow my Charleston Weather updates on Mastodon, Bluesky, Instagram, Facebook, or directly in a feed reader. Do you like what you see here? Please consider supporting my independent, hype-averse weather journalism and become a supporter on Patreon for a broader look at all things #chswx!