Charleston Weather Blog

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

Weekend forecast: Heat continues with afternoon thunderstorms

/ June 12, 2026 at 11:52 PM

Heat, humidity, and chances for afternoon thunderstorms continue into the weekend, with the potential for not only record high temperatures but also record warm low temperatures each day.

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Thursday: Getting warmer — and there’s more where that came from

/ June 10, 2026 at 11:09 PM

High pressure remains in control across the area, limiting afternoon thunderstorms and allowing heat to continue to build on Thursday. We’ll start in the mid-70s, warming to the mid-90s in the afternoon. Mix in dewpoints in the low-to-mid-70s and that will yield heat indices approaching or even slightly exceeding 100°. And while a brief popup sbower is never fully out of the question this time of year, the vast majority of us will stay rain-free.

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Rest of the work week: Turning up the heat

/ June 9, 2026 at 11:20 PM

Heat and humidity will continue to build as we head down the home stretch of the work week. We’ll also start to see an uptick in shower and thunderstorm chances as well, which should bring at least a little relief.

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Tuesday: Another warm and somewhat humid day; stray shower possible inland

/ at 12:02 AM

High pressure at the surface and aloft remain the main weather drivers heading into Tuesday, keeping us on the warm and humid side. We’ll start the day in the low-to-mid-70s, warming to around 90° in the afternoon. A weakening front to the north could kick up some stray showers generally for inland Berkeley, but the ridge aloft will likely keep a lid on more robust thunderstorm development. A similar setup will persist Wednesday before the ridge flattens out a bit, allowing for more shower and thunderstorm development getting into late week.

The week ahead: Decidedly summertime with afternoon storms and building heat

/ June 7, 2026 at 6:24 PM

Heat and humidity will feature prominently in the forecast this week as a more summertime pattern takes hold.

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Weekend forecast: Seasonably warm and generally quiet

/ June 5, 2026 at 9:38 PM

This weekend will be warm and a little more humid as surface high pressure moves into the Atlantic, sending winds more southerly behind it which turns the moisture tap back on. We should stay quiet, though, with ridging aloft and a pretty solid pocket of dry air hanging in there for a couple more days. We’ll see some clouds at times, particularly of the high variety, but otherwise expect plenty of sunshine to still break through for the weekend. Temperatures Saturday start in the mid-60s, warming to the low 90s in the afternoon, while Sunday feels much more like summer with a low around 70° and highs in the low 90s.

Rain chances gradually return as we get into the start of next week; these will generally be of the popup variety. Highs Monday top out in the mid-90s, while upper 80s to around 90° will be more common through the middle of next week.