Not sure if there are enough superlatives for how this Labor Day Weekend looks, weather-wise. Temperatures will be comfortably warm with reasonable humidity all weekend. Expect mid-80s Saturday and Sunday before we turn back toward 90° on Monday, though dewpoints in the mid-60s should negate any heat index impacts. Clouds will be few and far between, with predominantly sunny skies dominating. It’ll be a truly fantastic long weekend of weather, and I hope you can take advantage.
The only issue we’ll run into is some tidal flooding with each high tide cycle through Sunday morning. After Friday evening’s expected moderate flood, we’ll only see minor coastal flooding thereafter. You’ll simply want to keep an ear out for Coastal Flood Advisories from the National Weather Service so you know when the risk for a few closed roads will be highest.
Well, today was supposed to feature a lull in the shower and storm action, with more isolated coverage…and then it rained for five hours, flooding downtown Charleston again while 3-5″ of rain dumped on Johns Island and West Ashley. This was due to the combination of a stalled front and outflow from a thunderstorm cluster that developed to our northwest. Add in a little upper-level energy and you have a very, very soggy Thursday afternoon. Thankfully, the bulk of today’s rain is over and we should largely dry out overnight (though with fog a distinct possibility).
As we head into Friday, scattered storms remain in the forecast as the ever-present front remains close by. The impact on our weather will largely be driven by how far south it slips tonight into tomorrow. Right now, the expectation is that the greatest concentration of storms will be to our south and west, but I do anticipate that we’ll see a few more downpours tomorrow across the metro area, perhaps again having impacts on the evening commute.
Shower and storm coverage is expected to tick up a little bit more Saturday as onshore flow becomes a little more convergent at the surface. That’ll be the day with the greatest potential for persistent rainfall (at least as currently forecast). There is a little model disagreement with where the surface front will be, though, and so that’ll drive a little uncertainty. Heading into Sunday and Labor Day, rain chances continue to persist, with scattered coverage expected as a coastal trough develops and hangs around. This doesn’t look to be a full-day washout for Labor Day, but be ready to move outdoor activities inside.
With the persistent risk of scattered storms and the ensuing cloud cover, highs should stay in the mid-80s each day after starting in the lower 70s. This is around, if not a touch below, early September normals.
As we head into mid-week and look to round the corner toward Labor Day weekend, we’re going to see a reduction in shower and thunderstorm coverage for a few days as some drier air aloft works in from the north and west. We’ll keep isolated to scattered shower and thunderstorm chances in the forecast as those probabilities won’t be totally eliminated, particularly near the coast, but we shouldn’t see the sustained flooding rains that have been a concern the past couple days. Areas further inland could even see a rain-free couple days, especially on Thursday as a front clears the area and stalls to our south.
As rain chances diminish, temperatures turn back up to a little above normal as we close out August and enter September. Expect highs around 90° for Wednesday; mix in the plentiful humidity and it’ll feel closer to 100-102°. Thursday will run pretty warm, too, with highs around 90° and heat indices in the upper 90s once again expected. Rain chances begin to tick back up on Friday, and that’ll lead to high temperatures topping out a little lower than the previous couple days, generally in the mid-to-upper 80s.
You can likely already feel it in the air — drier air has filtered into the area today, and it feels so much better outside already after a really humid August. A stretch of nice weather will ensue, with temperatures running a little below normal for Friday and Saturday. Lows in the mid-to-upper 60s will feel pretty good, for sure, and we’ll top out in the mid-80s Friday & Saturday. Temperatures moderate a bit higher on Sunday, with dewpoints creeping up as well. Humidity does make a comeback for Monday with a slight chance of afternoon thunderstorms, but all in all, the vast majority of us will stay dry this Labor Day weekend. Hope you can take advantage!
@chswx is community-supported, hype-averse weather information, preparedness tips, and alerts for the Charleston, SC Tri-County area (Berkeley, Charleston, Dorchester counties) by Jared Smith.