Port Royal, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

658
FXUS62 KCHS 251129
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
629 AM EST Thu Dec 25 2025

.SYNOPSIS...
High pressure will prevail through the remainder of the holiday
week. A cold front will move through the area early next week.

&&

.NEAR TERM /THROUGH TONIGHT/...
The mid-levels will consist of northwest flow over our area,
with heights gradually lowering. At the surface, High pressure
will remain centered over the northeastern portion of the Gulf.
A weak stationary front located roughly along our northern tier
of counties early this morning will transition into a warm front
and lift north into this afternoon, then dissipate. Then, a
cold front will approach from the north late tonight. However,
the cold front is not expected to reach our area overnight.
Despite all of these synoptic features, dry weather is
forecasted. Morning clouds should dissipate, setting the stage
for a nice day, followed by some increasing clouds this evening
and overnight. Temperatures will remain well above normal. Highs
will peak in the mid to upper 70s across most of our area,
except cooler at the beaches. Lows will generally be in the 50s.

&&

.SHORT TERM /FRIDAY THROUGH SUNDAY/...
High pressure will remain to the south Friday into Saturday.
Meanwhile, a backdoor front will drop towards the area early
Friday, likely stalling nearby before lifting back north. Main
impact with the front will be some increased cloud cover and
slightly cooler (although still above normal) temperatures over
northern zones depending where the front ends up. Warm and dry
conditions will persist on Saturday. The highlight of the day
will be the temperatures, which are forecast to peak in the mid
to upper 70s over most locations. These values are within a few
degrees of records (see climate section below).

On Sunday, mid level ridge axis will shift overhead in advance
of the next trough passing through the Plains. It should be
another warm and dry day with highs spanning the 70s.

&&

.LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/...
A mid level trough will shift into the eastern U.S. on Monday,
sending a stronger cold front to the area. Frontal passage has
trended slower, so we should see temps back up in the 70s before
the front arrives in the afternoon or evening. Isolated showers
could accompany the front, but rain amounts look minimal, a few
hundredths of an inch at best (LREF 90th percentile for 24 hr
precip is only 0.06").

Noticeably colder temperatures are expected behind the front
for Tuesday and Wednesday. There is a concern for sub-freezing
temperatures to return, with Tuesday night into Wednesday
morning looking the chilliest. LREF probs for wind chills of 20
degrees or lower is generally around 10-20% west of I-95. No
precip is expected during this time period.

&&

.AVIATION /12Z THURSDAY THROUGH MONDAY/...
12Z TAFs: Ceilings around 5,000 ft should persist for the next
few hours. Though, any shallow fog is expected to dissipate
shortly after sunset. Otherwise, the TAFs should mainly be VFR.

Extended Aviation Outlook: A brief period of MVFR cigs/vsbys
will be possible Friday morning. Gusty winds are possible on
Monday.

&&

.MARINE...
Today and Tonight: High pressure will remain centered over the
northeastern portion of the Gulf. A weak stationary front
located roughly along our northern tier of counties early this
morning will transition into a warm front and lift north into
this afternoon, then dissipate. Then, a cold front will approach
from the north late tonight. Despite all of these synoptic
features, winds and seas won`t be high enough to prompt any
Small Craft Advisories.

Friday through Tuesday: Marine conditions are expected to
remain below Small Craft Advisory criteria through the weekend,
with winds generally 15 knots or less and seas 2-4 feet. The
main time period of concern is Monday into Tuesday ahead of and
behind a cold front. Winds gusts around 25 kts and seas up to
six feet will be possible, especially across the outer GA and
nearshore Charleston County waters.

&&

.CLIMATE...
Record High Temperatures:

December 25:
KCXM: 76/2008

December 27:
KCHS: 78/2021
KCXM: 76/2015
KSAV: 80/2015

&&

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

&&

$$

NEAR TERM...
SHORT TERM...ETM
LONG TERM...ETM
AVIATION...ETM
MARINE...ETM