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Author: Jared Smith

Jared Smith founded @chswx on Twitter in 2008 as an experiment in disseminating weather data through social media. In the ensuing decade-and-a-half, @chswx has provided live coverage of tropical cyclones, tornadoes, severe weather, and even a couple bouts of winter weather to the good people of Charleston, SC.

Tuesday: Northeast breeze persists, keeping us on the cooler side of normal

/ September 8, 2025 at 10:25 PM

Another quiet weather day is ahead as high pressure wedges across the area from the northeast. Expect a mix of sun and clouds with comfortable temperatures. We start the day in the mid-60s, warming to about 80° in the afternoon. It’ll be a bit breezy, with winds gusting around 15-20 MPH especially near the coast. These northeasterly winds will continue to drive tidal departures in Charleston Harbor above flood stage, and we should see minor to moderate flooding with the 9:35 AM high tide. Some flooding may have impacts on the tail end of the commute, so be prepared for delays if downtown is your destination.

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The week ahead: Cooler than normal temperatures with an elevated coastal flooding risk

/ September 7, 2025 at 10:47 PM

A front which helped stir up another round of heavy rain and flooding in downtown Charleston on Sunday will clear the area overnight into early Monday, yielding a week of comfortable temperatures with occasional slight shower and storm chances.

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Sunday: Storms return in the afternoon

/ September 6, 2025 at 4:50 PM

After a few welcome rain-free days, shower and storm chances return to the forecast for Sunday as a cold front moves into the area. We’ll start the day in the low 70s, working our way into the upper 80s in the afternoon before showers and storms kick off. Some rain could be heavy at times, and lightning may be an issue particularly inland where some stronger storms may be possible. It won’t be an all-day rainout, thankfully, but you’ll want to have your indoor plans ready to go if thunderstorms approach.

Isolated salt water flooding may also be a concern around the 7:47 PM high tide. The current total water level forecast brings the tide right to around 7′, which may be enough to cause a little flooding on the most vulnerable roads in downtown Charleston. The risk for coastal flooding around times of high tide increase throughout the first part of the week with the combination of the full moon, lunar perigee, and northeasterly winds in the wake of Sunday’s front, so stay tuned for Coastal Flood Advisories from the National Weather Service.

tropical update

Friday & the weekend: 90s return; rain holds off until Sunday

/ September 4, 2025 at 6:37 PM

Warmer and a little more humid air will return to the area Friday as winds go more southerly. With high pressure remaining in control for a few more days, though, we’ll stay largely quiet weather-wise this weekend before a front starts to affect the area later Sunday.

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Thursday: One more day of lower humidity and sunny skies

/ September 3, 2025 at 8:06 PM

We’ll start to turn a little warmer on Thursday as high pressure to the northeast breaks down a bit, but we should still get one more good day of low humidity in before we start to see dewpoints begin to climb back toward 70° starting Friday. Temperatures on Thursday start quite comfortably once again, with mid-60s the general rule across much of the area. We’ll warm to the upper 80s on Thursday afternoon with plenty of sunshine. The only fly in the ointment may be some very minor coastal flooding around the 6:19 PM high tide, with water levels currently forecast just below 7′. If water levels trend a little higher, a Coastal Flood Advisory may be issued. Otherwise, though, it’ll be another really nice early September day in the Lowcountry.

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Rest of the work week: Staying mostly quiet with gradually warming temperatures

/ September 2, 2025 at 8:00 PM

The rest of the work week will remain generally quiet (weather-wise, anyway), as high pressure remains in control at the surface. Temperatures will be on a warming trend as we get over the hump and into the second half of the work week as the mid-level trough that’s kept us on the cool side flattens out and retreats a bit north. We’ll also start to see high pressure build back in from the Atlantic for a few days, which turns the flow at the surface more southerly and starts to bring that more warm and humid air back to the area. We’re in the mid-80s Wednesday, upper 80s Thursday, and likely back to around 90° on Friday, with lows steadily climbing with the dewpoints back to around 70° by Friday morning. However, we look to stay rain-free through about Saturday before another front approaches for late weekend/early next week.

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Rest of the work week: Warming trend commences

/ September 1, 2025 at 7:20 PM

Mostly quiet weather is expected for the rest of the work week, with a warming trend taking us from the fall-like Labor Day weekend back to something a little more resembling summer by the end of the week, with highs back in the 90s by Friday.

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Beautiful but breezy Labor Day ahead

/ at 7:55 AM

High pressure wedging into the area from the north will make for a beautiful Labor Day and start to climatological fall. Temperatures are starting in the low to mid-60s for the first time since early June, and we’ll warm to the low to mid-80s in the afternoon under mostly sunny skies with an elevated northeasterly breeze keeping things on the cool side.

If the beaches are in your plans, it’ll be noticeably windier there — gusts 25-30 MPH will be possible — and there is a high risk of rip currents today as a result. Today just won’t be a good day to get into the ocean as it could turn dangerous in a hurry. However, the refreshing dry air and comfortable warmth will certainly help make up for it!

Friday & Labor Day weekend: Cooler-than-normal temperatures persist with an uptick in storm chances

/ August 28, 2025 at 8:32 PM

Friday is looking a little warmer but should remain rain-free as high pressure remains the main weather driver for at least one more day. Temperatures start in the upper 60s, warming to the mid-to-upper 80s in the afternoon under partly cloudy skies. An uptick in cloud cover and maybe a stray shower or two could accompany the seabreeze in the afternoon, but guidance keeps the majority of the area dry.

Shower and thunderstorm chances kick up a little bit for the weekend, though the trend has been a bit drier overall as high pressure to the north keeps the better rain chances further south. Still, waves of low pressure should at least kick up scattered coverage across the area especially in the afternoons, but it doesn’t look like a washout, and it will be a far, far cry from last weekend’s deluge. Temperatures will continue to run below normal; expect highs in the mid-80s each afternoon after starting each day in the upper 60s. It won’t feel much like summer as we unofficially bring it to a close, but it should still at least feel fairly pleasant when storms aren’t around.

Thursday: Another comfortable day, a few more clouds

/ August 27, 2025 at 9:59 PM

Another nice day lies ahead on Thursday, with a nice start in the upper 60s warming to the mid-80s in the afternoon. We should see a little uptick in cloud cover with a little higher-dewpoint air infiltrating in, but the forecast is largely rain-free. So, it’ll be another nice day to get out and about if you’ve got some time.

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