Charleston Weather Blog

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

Weekend forecast: A stray storm or two, but otherwise on the warm side

/ at 10:21 PM

Summer heat will continue this weekend with limited chances for a few storms to cool things off. Saturday will start in the mid-70s, warming to the low-to-mid-90s in the afternoon. Mix in dewpoints in the low 70s, and it’ll feel more like the mid-to-upper 90s. There will be a bit more moisture available Saturday, which could allow for slightly greater storm coverage as the seabreeze pushes inland during the afternoon. However, most of us shouldn’t count on a storm to cool things off. Any storms that fire will dissipate with the loss of daytime heating.

A stray storm or two will be possible Sunday, but the vast majority of us should stay rain-free as dewpoints once again mix down to the low 70s in the afternoon owing to a lot of dry air aloft. We’ll warm to the low 90s, but the lower dewpoints keep heat indices relatively in check, only running a few degrees above the air temperature. That’s not to say that feeling like the mid-90s is in any way “cool” though!

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Friday & the weekend: Standard summertime fare with heat, humidity, and a few storms

/ June 19, 2025 at 11:50 PM

As we reach the summer solstice late Friday night (10:20 PM, to be exact), the weather will be seasonally appropriate. We can generally expect temperature in the low to mid-90s each afternoon after muggy starts in the mid-70s. Showers and thunderstorms will be possible particularly Friday and Saturday afternoons along and ahead of the seabreeze, though updrafts will struggle against high pressure building in aloft. In fact, we should generally see a lid on things for Sunday, making for a mostly sunny day. Heat indices will still run in the upper 90s to around 100°, so be sure you’re getting plenty of water and rest if you’re working or playing outside.

Thursday: Another hot day with storms possible

/ June 18, 2025 at 11:48 PM

More heat and humidity are on tap for Thursday, but with a slightly better chance of storms in the afternoon especially as a front gets closer to the area. We’ll start the day in the mid-70s once again, warming back to the mid-90s in the afternoon. We’ll be keeping an eye on a line of thunderstorms to our northwest, which could help induce some stronger storms in the metro later in the afternoon through the evening hours. Damaging wind gusts would be the primary concern in the strongest storms, though the risk for severe weather is generally low (but not zero) across the area.

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Rest of the work week: Heat continues; storm chances increase

/ at 7:47 PM

The rest of the work week will remain quite warm, especially Wednesday and Thursday as less in the way of showers and thunderstorms are expected before a trough of low pressure and accompanying front swing through to stir up more storms for Friday.

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Tuesday: Turning warmer, a stray storm possible

/ June 16, 2025 at 8:03 PM

High pressure will continue to build in aloft, sending temperatures upward and storm chances downward. Tuesday will be another rather warm day, with lows in the mid-70s to start the day warming to the low 90s in the afternoon. Mix in dewpoints running in the low 70s, and that’ll yield heat indices right around the 100-101° mark during the height of the afternoon. Heat indices could even briefly spike in the immediate wake of the seabreeze as dewpoints surge before temperatures start to fall.

A storm or two will be possible along and ahead of the seabreeze, but with the capped atmosphere, it’s going to be tough to get much, if anything, to break through, much less sustain itself. Still, though, you can never completely rule it out this time of year.

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