Charleston Weather Blog

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

The week ahead: 90°+ streak continues with a couple stormy days mixed in

/ June 29, 2025 at 10:48 PM

Warm, humid, and occasionally stormy days lie ahead to close out June and bring in July. (Side note: It’s insane that we’re entering the second half of 2025!) Temperatures look to remain in the 90s each afternoon, and if the forecast works out, the current 16-day streak of 90°+ high temperatures should continue through a third and into a fourth week (23 days, to be exact).

A cold front will approach the area on Wednesday into Thursday, stalling out before it reaches us (of course). This will increase the risk for showers and thunderstorms for those two days in particular, and if there’s a period that could impact that 90° streak, this is it. Regardless, it’ll still be steamy and stormy.

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Weekend forecast: A seasonally-appropriate end to June

/ June 27, 2025 at 6:22 PM

The final weekend of June will have that classic end-of-June feel: lows in the mid-70s, highs in the mid-90s, and isolated to scattered afternoon thunderstorms each day.

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Friday & the weekend: 90s continue with a few storms each afternoon

/ June 26, 2025 at 6:05 PM

A fairly standard summer setup will take shape for Friday and the weekend as high pressure in the Atlantic ridges westward across the area, keeping temperatures warm and humid with daily storm chances. We can generally expect temperatures to start in the mid-70s each morning, with temperatures warming to the low to mid-90s each afternoon as our run of 90° days dating back to June 14 continues. Dewpoints ahead of the seabreeze will mix out with some drier air aloft to keep heat indices from getting too far out of hand, with apparent temperatures running just 3 or 4° warmer than air temperatures. Still, if you have vulnerability to the heat, be mindful of too much strenuous activity during the afternoons.

We should see isolated to scattered showers and thunderstorms fire along and ahead of the seabreeze each afternoon. The risk for severe weather is very low, but there’s always the risk for a storm or two to briefly turn strong to severe especially where thunderstorm outflow boundaries collide. Remember, all thunderstorms are dangerous because of the lightning they produce. When thunder roars, go indoors!