Charleston Weather Blog

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

Warmest day of 2021 so far expected today, with thunderstorm chances this evening

/ May 4, 2021 at 6:57 AM

After the high topped out at 88° yesterday, we look to take at least one step closer to 90° today with another very summer-like day ahead. Humid air will allow heat indices to head up into the mid-90s for the first time this year. We’ll stay dry for much of the day absent any triggers for thunderstorm development, with our best chance of showers and thunderstorms coming later this evening (much like last night). Once again, we’ll be looking to our west throughout the day to nail down timing of any showers and thunderstorms that impact the area. Much like last night, there will be a damaging wind risk as well with the strongest thunderstorms, so keep an ear out to forecast updates throughout the day.

The week ahead: Warmest weather so far this year to start the week

/ May 2, 2021 at 6:51 PM

Get ready for a very summer-like start to your week. High pressure slipping into the Atlantic with a little ridging aloft will keep us warm — dare I say it, hot — and humid for the first part of the week. Showers and thunderstorms will be possible each day through Thursday before a cold front swings through with drier air and more pleasant temperatures for the weekend.

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Nice weekend shaping up ahead of an unsettled-looking week

/ April 30, 2021 at 7:10 PM

We’ve got a good-looking weekend queued up to start May. A cold front came through earlier today, and drier air is moving into the area from the north. This will make for a comfortable start to Saturday, with lows bottoming out in the mid-50s. Temperatures will rise into the mid-to-upper 70s under a mostly sunny sky — a really great day to get outdoors. Sunday will turn a little warmer with highs topping out in the low 80s under partly cloudy skies, but should still be quite nice.

As we get into next week, the pattern turns a little more unsettled with shower and thunderstorm chances each day through Thursday, though this should all settle out for another gorgeous weekend afterward. Enjoy!

Friday: Quite warm, but drying out behind a cold front

/ at 7:37 AM

This morning, we find a cold front moving into the Upstate of SC. Said front looks to cross the area this afternoon with mostly little fanfare; expect mostly clear skies by sundown. Despite the front, today will be the warmest day of the week as deep downslope flow in the wake of the front allows temperatures to warm into the upper 80s. Dewpoints will trend downward, though, and it will feel pretty good outside despite the higher heat to close April. The weekend looks pretty good, with an especially nice day coming up on Saturday — more later today!

Thursday: Turning warmer

/ April 28, 2021 at 10:14 PM

We’re going to feel a little more like late May than late April tomorrow as high pressure slides a little more offshore with strong ridging remaining aloft. Humidity creeps up a little bit, and with a little compressional warming beginning ahead of a cold front, temperatures will get into the mid-80s in the afternoon. We will remain rain-free for at least one more day given the ridging aloft; with only a slight chance of thunderstorms on Friday as the front swings through, it is conceivable we will stay rain-free through the weekend as high pressure builds back in behind it, cooling things off a little for Saturday.

Minor coastal flooding will remain an issue with the evening high tides through Friday. Winds will then shift offshore and lingering astronomical influences will wane, ending this cycle of coastal flooding.

Another warm day for Wednesday

/ April 27, 2021 at 8:33 PM

If you liked today, you’ll like Wednesday — we’ll get back up into the low 80s under mostly sunny skies. Temperatures will run a little warmer in the morning thanks to a little more cloud cover overnight, but will still be largely comfortable around 60°. The warming trend continues into Thursday, when we’ll reach into the mid-80s across the area ahead of a cold front. Said front looks to bring some showers and thunderstorms into the forecast for Friday, but the exact details of how rain will go down are still a little iffy. Stay tuned.

Coastal flooding will remain a concern with the 10:10 PM high tide Wednesday night as lingering astronomical influences and onshore flow persists. We’ll likely have another Coastal Flood Advisory as a result.