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Summerville, South Carolina 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Summerville SC
National Weather Service Forecast for: Summerville SC
Issued by: National Weather Service Charleston, SC
Updated: 1:41 pm EDT Jul 17, 2025
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 93. Heat index values as high as 103. South wind around 10 mph.
Slight Chance
T-storms

Tonight

Tonight: Mostly clear, with a low around 76. South wind 3 to 7 mph.
Mostly Clear

Friday

Friday: A 30 percent chance of showers and thunderstorms, mainly between 2pm and 3pm.  Mostly sunny, with a high near 96. Heat index values as high as 107. Southwest wind around 6 mph.
Mostly Sunny
then Chance
T-storms
Friday
Night
Friday Night: Mostly clear, with a low around 76. Southwest wind 3 to 6 mph.
Mostly Clear

Saturday

Saturday: A 20 percent chance of showers and thunderstorms after 2pm.  Sunny, with a high near 98. Southwest wind 5 to 7 mph.
Sunny then
Slight Chance
T-storms
Saturday
Night
Saturday Night: Mostly clear, with a low around 78.
Mostly Clear

Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 2pm.  Sunny, with a high near 99.
Sunny then
Slight Chance
T-storms
Sunday
Night
Sunday Night: A 20 percent chance of showers and thunderstorms before 2am.  Partly cloudy, with a low around 77.
Slight Chance
T-storms

Monday

Monday: Showers and thunderstorms likely, mainly after 2pm.  Mostly sunny, with a high near 97. Chance of precipitation is 60%.
Slight Chance
T-storms then
T-storms
Likely
Hi 93 °F Lo 76 °F Hi 96 °F Lo 76 °F Hi 98 °F Lo 78 °F Hi 99 °F Lo 77 °F Hi 97 °F

Hazardous Weather Outlook
 

This Afternoon
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Heat index values as high as 103. South wind around 10 mph.
Tonight
 
Mostly clear, with a low around 76. South wind 3 to 7 mph.
Friday
 
A 30 percent chance of showers and thunderstorms, mainly between 2pm and 3pm. Mostly sunny, with a high near 96. Heat index values as high as 107. Southwest wind around 6 mph.
Friday Night
 
Mostly clear, with a low around 76. Southwest wind 3 to 6 mph.
Saturday
 
A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 98. Southwest wind 5 to 7 mph.
Saturday Night
 
Mostly clear, with a low around 78.
Sunday
 
A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 99.
Sunday Night
 
A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 77.
Monday
 
Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 97. Chance of precipitation is 60%.
Monday Night
 
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 74. Chance of precipitation is 60%.
Tuesday
 
Showers and thunderstorms likely. Mostly cloudy, with a high near 90. Chance of precipitation is 70%.
Tuesday Night
 
Showers and thunderstorms likely. Mostly cloudy, with a low around 74. Chance of precipitation is 60%.
Wednesday
 
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Wednesday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Thursday
 
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

 

Forecast from NOAA-NWS for Summerville SC.

Weather Forecast Discussion
170
FXUS62 KCHS 171803
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
203 PM EDT Thu Jul 17 2025

.SYNOPSIS...
Sub-tropical high pressure will prevail through the weekend,
then a cold front will stall nearby into the area early next
week.

&&

.NEAR TERM /THROUGH TONIGHT/...

Rest of this afternoon: Scattered to isolated showers will
continue to slowly push inland with south-southwest low level
flow around the west side of a deep layer sub-tropical ridge.
Brief thunderstorms will be possible, especially over our GA
zones and interior SC zones. Temperatures in the lower to mid
90s, coupled with dewpoint temperatures in the lower to mid 70s,
will result in max heat indices of 100-105 degrees.

Tonight: Any showers or isolated storms are expected to dissipate
quickly with the loss of heating. The rest of the night is
expected to be mostly clear to partly cloudy, but warm, with
lows again in the mid to upper 70s, except near 80 close to the
coast.

&&

.SHORT TERM /FRIDAY THROUGH SUNDAY/...
This deep layered ridge centered across the Atlantic waters will
expand across the region over the weekend, maintaining typical
summertime conditions for the Lowcountry. Temperatures slowly
increase as this ridge expands overhead, with highs in the mid to
upper 90s (with cooler temperatures along the coastline). With this,
heat indices could reach above 108F on Saturday and Sunday and a
Heat Advisory may be needed. Thanks for fairly strong dry air at the
mid-levels, shower and thunderstorm activity should be fairly
limited and PoPs were left at 20-30%.

&&

.LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/...
Heading into the work week, this aforementioned high pressure
eventually begins to breakdown as the ridge axis shifts more
westward over the Gulf. A series of shortwaves will pass through the
region from the north throughout the period. This pattern change
will setup for a more active and rainy week ahead. Additionally, a
weak surface front might stall nearby on Monday afternoon, possibly
lingering into Tuesday. Temperatures will remain near and slight
above normal for this time of the year.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
The 18z TAF period KCHS, KJZI, and KSAV will be dominated by VFR
conditions. Isolated to scattered showers are expected to mainly
push inland of KCHS and KJZI through this afternoon and
evening. KSAV will have the threat for a shower, possibly a
brief thunderstorm through about 20z this afternoon. Wind gust
of 15 to 20 knots likely through through this afternoon.

Extended Aviation Outlook: VFR will mainly prevail throughout the
period, however brief flight restrictions are possible within
showers and thunderstorms that develop in the afternoon and/or
evening hours.

&&

.MARINE...
Rest of This Afternoon: No highlights are expected. Breezy
conditions will continue near the coast and within the
Charleston Harbor, where south-southwest winds will gust to 15
to 20 knots. Scattered showers beyond 20 nm are not expected to
move any closer to the coast through the afternoon. Seas 2 to 3
feet.

Tonight: Winds generally southwest 5 to 15 knots with seas
remaining 2 to 3 feet. Isolated to scattered showers late,
mainly beyond 20 nm offshore.

Friday through Tuesday: Expect generally south to south-westerly
flow at 10 to 15 kt. This flow pattern will generally be driven by
the circulation around the subtropical high pressure centered over
the western Atlantic. It could become a bit gusty each afternoon
with gusts up to 15 to 20 kt as the seabreeze pushes inland (gusts
strongest across the immediate coastline and the Charleston Harbor).
Mix of southerly windswell and underlying southeast swell will be on
tap throughout the period. This could set up some good surf for the
local beaches over the next couple days. Seas will range from 2 to 3
ft, except a brief swell of 3 to 4 ft on Saturday night through mid-
day Sunday across the South Carolina nearshore waters. Otherwise, no
marine concerns expected.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...None.
MARINE...None.

&&

$$

NEAR TERM...RFM
SHORT TERM...Dennis
LONG TERM...Dennis
AVIATION...RFM
MARINE...Dennis/RFM
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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