Charleston Weather Blog

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

Sunday: Off and on rain could bring pockets of flooding

/ May 18, 2024 at 11:31 PM

Another round of showers and thunderstorms is expected on Sunday. A stalled cold front will cut down on the surface-based instability, so severe weather is not expected, but there’s still quite a bit of moisture around and a mid-level trough hanging right overhead. This will be enough to kick up more showers and thunderstorms, with heavy rain the main concern. The NWS forecast is for generally around 1-2” of rain tomorrow, with isolated spots receiving upwards of 3-4” in the heaviest rains. A flooding threat could result, causing travel to become treacherous at times. We’ll want to keep an eye on this throughout the day — stay tuned.

Temperatures behind the front will top out just around 80° after a muggy start in the upper 60s. Highs will remain tempered by ongoing showers and thunderstorms as well. Stay dry!

Friday & the weekend: Back into an unsettled period

/ May 16, 2024 at 11:39 PM

After a warm but quiet day Thursday, unsettled weather starts to work back into the area beginning Friday and continuing over the weekend.

We start Friday in the upper 60s to around 70°, warmer toward the beaches. We should see highs peak in the mid-to-upper 80s despite increasing cloud cover ahead of a disturbance that’ll bring some slight rain chances into the area on Friday evening into the overnight. It is also possible we may see a stray shower or storm midday as a decaying thunderstorm complex moves across the area. We’ll monitor precipitation trends throughout the day; keep rain gear handy just in case.

Shower and thunderstorm chances tick up for Saturday. It doesn’t look like an all-day rainout, but there will be periods of unsettled weather throughout the day, so be on guard for outdoor activities having to come indoors due to lightning and maybe even a strong to severe storm or two with damaging wind gusts the main concern. Temperatures will stay warm and muggy: Expect lows in the low 70s to yield to highs in the mid-to-upper 80s once again in the afternoon.

A front gets through late Saturday, and that leaves us with a slightly cooler Sunday with highs reaching just the low-to-mid-80s. However, periods of showers and thunderstorms will still be possible, and a couple of those could still be on the strong side. Keep rain plans front-of-mind for your Sunday as well.