Charleston Weather Blog

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

Friday & the weekend: Heat, humidity, and storm chances resume

/ September 17, 2026 at 10:57 PM

Summer is far from finished with us yet. After a couple days with relatively drier air and slightly cooler temperatures, we’re back to the 90s on Friday as surface winds swing around a little more westerly than we’ve seen the past few days. It should be a mostly sunny day, though clouds will increase later in the day with the potential for a shower or two to potentially migrate in from the north late. At least we get off to one more seasonable start as lows take one more trip to the mid-60s before a stretch of 70s lows kicks off Saturday.

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Thursday: Mostly sunny skies continue

/ September 16, 2026 at 10:21 PM

Another warm mid-September day lies ahead for Thursday as high pressure remains the dominant weather feature at the surface and aloft. We’ll get off to another pleasant start with lows in the upper 60s warming to the upper 80s in the afternoon with dewpoints in the mid-to-upper 60s away from the coast, where dewpoints will settle in the 70-72° range. Dry air in the atmospheric column will make for mostly sunny skies, with just a few passing clouds expected.

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Rest of the work week: An ever-so-brief encounter with drier air

/ September 15, 2026 at 11:29 PM

Drier air courtesy of high pressure wedging southwestward across the area will characterize the rest of the work week, bringing slightly more comfortable dewpoints to the area and seasonable temperatures for mid-September.

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Tuesday: Breezy and not quite as hot

/ September 14, 2026 at 10:11 PM

A front coming through on Tuesday will knock temperatures back from the record levels of the past two days, bringing some breezy conditions and maybe some coastal flooding in the process. We start the day in similar fashion to the past couple days, with lows in the mid-70s expected. High pressure building south will swing winds around to the east and northeast in the morning, turning things gusty in the process (especially at the coast). This wind may also help drive tidal departures higher, perhaps causing some minor coastal flooding with the midday high tide. Widespread flooding issues are not expected, though. We will see dewpoints begin to drop during the afternoon with highs peaking just in the upper 80s, right around mid-September normals.

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The week ahead: Record heat possible Monday, but a whiff of seasonable air coming

/ September 13, 2026 at 11:27 PM

We tied a record high Sunday, and should at least threaten if not break the daily record again on Monday. From there, slightly cooler high pressure builds in from the northeast, bringing a little whiff of more seasonable air for mid-September.

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