Charleston Weather Blog

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

Tuesday: Plenty of sunshine — and plenty warm, too

/ May 18, 2026 at 5:53 PM

More sunshine is in the offing for Tuesday with high pressure in continued control of our weather. The air will have a bit of an early summer feel to it with lows bottoming out in the mid-60s, warming to the upper 80s and perhaps approaching 90° in the afternoon. Dewpoints will mix down to the mid-60s in the afternoon, so while it won’t be excruciatingly humid, there will definitely be a bit more heaviness to the air, so to speak.

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The week ahead: Warm and then turning unsettled

/ at 5:30 PM

The upcoming week will have an early-summer feel with high pressure remaining in control for the first part of the week before a front stalls out nearby, bringing some rain chances back into the picture heading into the weekend.

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Weekend forecast: Turning warmer with a few more clouds

/ May 15, 2026 at 10:12 PM

We’ll turn warmer over the weekend as high pressure aloft and at the surface remain the main weather features. With high pressure moving offshore, winds out of the south and southeast will bring warmer and somewhat more humid air into the area. This will contribute to a little more in the way of cloud cover, but despite that cloud cover, highs still peak in the mid-80s. Clouds thicken in the mid and upper levels on Sunday, but that doesn’t stop temperatures from running in the upper 80s in the afternoon. Shouldn’t see any rainfall, though, as the better moisture and rain chances will be well, well inland. Not excellent for the ongoing extreme to exceptional drought across parts the Lowcountry.

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Friday & the weekend: Plenty of sunshine, increasingly warm

/ May 14, 2026 at 9:26 PM

Generally quiet weather will continue for Friday and the weekend with high pressure in control. If you liked Thursday’s weather, we have more of that comfortable warmth in store for Friday. We’ll start the day a bit below normal — generally mid-50s — and warm to the low 80s in the afternoon.

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Thursday: More sunshine, comfortable warmth

/ May 13, 2026 at 6:13 PM

A cold front will swing through early Thursday with high pressure to build in behind it. Temperatures will start in the low 60s, warming to the low-to-mid-80s in the afternoon with northwesterly winds around 10 MPH. The downslope flow will dry out the atmosphere pretty nicely, allowing for mostly sunny skies with maybe a few fair weather clouds. The drier air will make the 80s highs feel a little more comfortable, too. Overall, it’s a good day to try to get some sunshine in the midst of the daily grind.

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Rest of the work week: Turning warmer and sunnier

/ May 12, 2026 at 6:01 PM

Generally quiet weather will be the rule for the rest of the work week as dry high pressure builds in from the northwest, keeping temperatures near mid-May norms.

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Tuesday: Mostly cloudy and a bit on the cool side for mid-May

/ May 11, 2026 at 9:48 PM

High pressure nudging in from the north will keep cloud cover in place and cool us off a bit for Tuesday after the third 90° day of the year on Monday. We’ll start the day in the upper 50s, warming to about the mid-70s given the expected cloud cover. A shower could get close to far southern Charleston County during the day, but most of us should stay rain-free.

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