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Hilton Head Island, South Carolina 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Hilton Head Island SC
National Weather Service Forecast for: Hilton Head Island SC
Issued by: National Weather Service Charleston, SC
Updated: 1:32 pm EDT Jul 12, 2025
 
Tonight

Tonight: A 30 percent chance of showers and thunderstorms, mainly before 2am.  Partly cloudy, with a low around 75. Southwest wind 3 to 7 mph.
Chance
T-storms

Sunday

Sunday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Some of the storms could produce heavy rainfall.  Mostly sunny, with a high near 92. Heat index values as high as 103. West wind 3 to 6 mph.
Sunny then
Heavy Rain

Sunday
Night
Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm.  Partly cloudy, with a low around 78. Light south wind.
Chance
T-storms

Monday

Monday: A 40 percent chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 89. Calm wind becoming east around 6 mph in the afternoon.
Sunny then
Chance
T-storms
Monday
Night
Monday Night: A 30 percent chance of showers and thunderstorms before 8pm.  Partly cloudy, with a low around 77. East wind around 5 mph becoming calm  in the evening.
Chance
T-storms then
Partly Cloudy
Tuesday

Tuesday: Showers and thunderstorms likely, mainly after 2pm.  Partly sunny, with a high near 87. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
T-storms
Likely

Tuesday
Night
Tuesday Night: Showers and thunderstorms likely, mainly before 8pm.  Mostly cloudy, with a low around 77. Chance of precipitation is 60%.
T-storms
Likely then
Chance
T-storms
Wednesday

Wednesday: A chance of showers and thunderstorms before 8am, then showers and possibly a thunderstorm between 8am and 2pm, then showers and thunderstorms likely after 2pm.  High near 86. Chance of precipitation is 80%.
Showers then
T-storms

Wednesday
Night
Wednesday Night: Showers and thunderstorms likely, mainly before 8pm.  Mostly cloudy, with a low around 78. Chance of precipitation is 60%.
T-storms
Likely then
Chance
T-storms
Lo 75 °F Hi 92 °F Lo 78 °F Hi 89 °F Lo 77 °F Hi 87 °F Lo 77 °F Hi 86 °F Lo 78 °F

 

Tonight
 
A 30 percent chance of showers and thunderstorms, mainly before 2am. Partly cloudy, with a low around 75. Southwest wind 3 to 7 mph.
Sunday
 
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Some of the storms could produce heavy rainfall. Mostly sunny, with a high near 92. Heat index values as high as 103. West wind 3 to 6 mph.
Sunday Night
 
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 78. Light south wind.
Monday
 
A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Calm wind becoming east around 6 mph in the afternoon.
Monday Night
 
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 77. East wind around 5 mph becoming calm in the evening.
Tuesday
 
Showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
 
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 77. Chance of precipitation is 60%.
Wednesday
 
A chance of showers and thunderstorms before 8am, then showers and possibly a thunderstorm between 8am and 2pm, then showers and thunderstorms likely after 2pm. High near 86. Chance of precipitation is 80%.
Wednesday Night
 
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 78. Chance of precipitation is 60%.
Thursday
 
Showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Thursday Night
 
Showers and thunderstorms likely. Mostly cloudy, with a low around 78. Chance of precipitation is 60%.
Friday
 
Showers and thunderstorms likely. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Friday Night
 
Showers and thunderstorms likely. Partly cloudy, with a low around 78. Chance of precipitation is 60%.
Saturday
 
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Hilton Head Island SC.

Weather Forecast Discussion
435
FXUS62 KCHS 121803
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
203 PM EDT Sat Jul 12 2025

.SYNOPSIS...
Weak high pressure will continue to build across the region
into early next week. By mid-week, a surface front might sag
into the region increasing storm activity.

&&

.NEAR TERM /THROUGH TONIGHT/...
This Afternoon: A typical summertime pattern is expected this
afternoon as ridging aloft centered near southern Florida
extends northward into the region. Similar to the last several
days there is not much consistency between the CAMs. Convection
has begun just west of the forecast area and will likely be
pushing into the region within the next hour or so. Coverage is
forecast to increase this afternoon as outflow boundaries
interact and the sea breeze pushes inland. The severe threat
this afternoon remains low as ML CAPE is around 2000-2500 J/kg
but DCAPE values are only around 500 J/kg. However, a strong
thunderstorm cannot be ruled out, with damaging wind gusts the
main hazard. Additionally, a significant amount of lightning
will be likely with storms this afternoon, as seen over the last
several afternoons. The atmosphere is very moist, the 12Z KCHS
RAOB Sounding showed a PWAT value of 2.25 inches. Heavy rainfall
will be possible this afternoon, with the 12Z HREF highlighting
the coastal counties in a 10% probability of >3 inches. Minor
flooding of low lying and poor drainage areas is possible,
especially over areas that have seen lots of recent rainfall.

Tonight: Showers and thunderstorms are forecast to diminish with
nightfall, when the best chances for precipitation shifts
offshore. Overnight temperatures will be near normal in the 70s.

&&

.SHORT TERM /SUNDAY THROUGH TUESDAY/...
A weak upper-lvl ridge will briefly build across the Gulf Coast this
weekend. Simultaneously, a broad ridge will remain off the East
Coast as rich moisture continues to advect into the region with PWAT
values ~2.0 inches through early next week. This will be more than
enough moisture to spark up some showers and thunderstorms each
afternoon as the sea breeze pushes inland. Expect temperatures to be
in the mid to upper 90s on Sunday and Monday, with upper 80s to low
90s on Tuesday. Heat index values look to be in the 100 to the 107
degree range, specifically on Sunday and Monday in the afternoon
hours. As of right now, these values remain under Heat Advisory
Criteria (108F), however we will continue to be monitor these values
over the next couple days. With these temperatures in place and
dewpoints in the the low to mid 70s, moderate instability should
develop and it`s possible to see strong to severe thunderstorms each
afternoon. Overnight lows will remain mild and only dip into the low
to mid 70s (with warmer temperatures closer to the beaches).

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
This current pattern will be slow to change as this weak upper-lvl
ridge eventually begins to break down in the middle part of next
week. A weak front could settle nearby with storm activity gradually
increasing by the end of the week. In addition to the front, there
is some indication of a weak surface low developing over the Florida
Panhandle sometime next week and allow for an enhanced region of
moisture to advect across the Southeast. With this setup, heavy
rainfall could be an issue, however models remain all over the place
with the rainfall amounts that it`s difficult to pinpoint exact
locations this far out in the forecast. Temperatures will remain
near normal for this time of the year.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
The 18Z TAF period will initialize with VFR conditions at
KCHS/KJZI/KSAV. There are some MVFR cigs lingering around KSAV,
however these are expected to quickly erode to VFR. Showers and
thunderstorms are possible again this afternoon, with VCTS
included at all three TAF sites starting around 21/22Z.
Confidence in direct impacts to KSAV remain low, so the 18Z TAF
only features VCTS. A TEMPO group for TSRA has been maintained
at KCHS/KJZI from 22Z to 01Z. Thereafter prevailing VFR is
expected through the remainder of the 18Z TAF period.

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...
This Afternoon and Tonight: Surface high pressure will hold
strong over the local marine waters through tonight with SW
winds generally less than 15 knots. There could be some gusts to
around 20 knots this afternoon along the immediate coastline
associated with the sea breeze. Thunderstorms are possible again
this afternoon as land-based storms push offshore. Additional
thunderstorms are possible over the marine zones through the
overnight period. Frequent lightning and gusty winds will be the
main hazards. Seas through the period should average 2 to 3 ft.

Sunday through Wednesday: Expect generally southerly winds at 5 to
10 kt to prevail throughout the period. 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). Southeasterly swell will continue to mix into
the local waters over through early next week. Seas will be 2 to 3
ft, then increase to 3 to 4 ft on Wednesday. Otherwise, no marine
concerns expected.

&&

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

&&

$$

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






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