Summerville, South Carolina 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Summerville SC
National Weather Service Forecast for:
Summerville SC
Issued by: National Weather Service Charleston, SC |
Updated: 2:03 pm EDT Aug 12, 2025 |
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This Afternoon
 Chance T-storms
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Tonight
 Chance T-storms then Mostly Cloudy
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Wednesday
 Mostly Sunny then Chance T-storms
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Wednesday Night
 Slight Chance T-storms
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Thursday
 Mostly Sunny then Chance T-storms
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Thursday Night
 Chance T-storms then Chance Showers
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Friday
 Slight Chance T-storms then Chance T-storms
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Friday Night
 Chance T-storms
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Saturday
 Slight Chance T-storms then T-storms Likely
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Hi 90 °F |
Lo 75 °F |
Hi 92 °F |
Lo 76 °F |
Hi 92 °F |
Lo 76 °F |
Hi 92 °F |
Lo 76 °F |
Hi 91 °F |
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Hazardous Weather Outlook
This Afternoon
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A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 90. Heat index values as high as 105. South wind around 5 mph. |
Tonight
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A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 75. South wind around 5 mph becoming calm in the evening. |
Wednesday
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A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 92. Heat index values as high as 106. Calm wind becoming southwest around 6 mph in the morning. |
Wednesday Night
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A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76. Southwest wind around 6 mph. |
Thursday
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A 50 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 92. Southwest wind 5 to 8 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
Thursday Night
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A 30 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76. |
Friday
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A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 92. Chance of precipitation is 50%. |
Friday Night
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A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 76. |
Saturday
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Showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 60%. |
Saturday Night
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Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 74. Chance of precipitation is 60%. |
Sunday
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A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. |
Sunday Night
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A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 73. |
Monday
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A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. |
Monday Night
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Mostly clear, with a low around 73. |
Tuesday
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A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. |
Forecast from NOAA-NWS
for Summerville SC.
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Weather Forecast Discussion
178
FXUS62 KCHS 121840
AFDCHS
Area Forecast Discussion
National Weather Service Charleston SC
240 PM EDT Tue Aug 12 2025
.SYNOPSIS...
High pressure will prevail across the region through the end of
the week and into the weekend.
&&
.NEAR TERM /THROUGH TONIGHT/...
Current - This Afternoon: Outside of a few isolated showers, have
seen largely quiet conditions prevail across the region today.
Temperatures and dewpoints have also been notably higher than days
past, resulting in heat index values between 100 to 106 degrees.
While a few locations may reach heat advisory criteria briefly,
believe the spatial and temporal scale will remain limited enough to
forgo any headlines. Thus, will continue to carry the Special
Weather Statement. As alluded to in the previous discussion,
sounding profiles still remain fairly unstable across the region,
which may support an isolated severe storm or two capable of
producing damaging winds and small hail. Otherwise, expect typical
summertime seabreeze convection to prevail this afternoon,
with higher PoPs focused over parts of the Charleston Tri-County.
Tonight: Convection will quickly wane this evening with isolated to
scattered showers and storms redeveloping over the Atlantic after
midnight. Lows tonight will range from the lower-mid 70s inland with
upper 70s/near 80 closer to the coast and beaches, including
Downtown Charleston.
&&
.SHORT TERM /WEDNESDAY THROUGH FRIDAY/...
Wednesday and Thursday, the center of a 595 dm ridge will build over
FL and the eastern Gulf. High temperatures are forecast range in the
low to mid 90s. Forecast soundings indicate a weak subsidence
inversion around H7 should be overcome during the heat of the
afternoon, yielding scattered (30-40% PoP) convection along the sea
breeze. In addition, heat index around 105 degrees should be common
each afternoon.
Friday, the H5 ridge is forecast to shift over the northern Gulf
coast, with a secondary ridge centered over the central CONUS.
Overall, conditions will remain comparable with Wednesday and
Thursday. However, given steady SSW flow, dewpoints may increase by
a degree or two with high temperatures in the low to mid 90s. The
hottest heat index readings should occur on Friday, around 105
degrees. However, portions of coastal SE GA and lower SC may see
heat index values peak around 108 degrees.
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
Friday into early next week, H5 ridge will shift over the lower
Mississippi River Valley. GFS indicates that a shortwave could
ripple across forecast area early next week. This pattern should
yield a typical summer-time pattern with scattered afternoon and
evening thunderstorms and hot and humid conditions. Heat index
values may peak in the lower 100s each afternoon, primarily across
coastal GA and the lower SC coast on Friday. High temperatures in
the upper 80s to low 90s.
&&
.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
12/18z TAF Discussion:
KCHS/KJZI/KSAV: VFR conditions are expected to largely
prevail. Could see a few isolated showers and storms develop this
afternoon as the sea breeze moves inland, which may result in a
brief period of MVFR cigs/vsbys at all terminals. Nonetheless, have
opted to forgo any mention for the time being given that confidence
in exact location remains low.
Extended Aviation Forecast: Brief flight restrictions will be
possible due to afternoon showers/thunderstorms.
&&
.MARINE...
Through Tonight: There are no concerns with southerly winds 15 kt or
less prevailing. Seas will average 2-3 ft.
Wednesday through Sunday: The pattern should generally support south
winds between 10 to 15 kts, turning from the east early next week.
Seas should remain between 2 to 3 ft. Swells associated with TC Erin
may remain the marine zones after Monday.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...None.
MARINE...None.
&&
$$
NEAR TERM...SST
SHORT TERM...NED
LONG TERM...NED
AVIATION...NED/SST
MARINE...NED/SST
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