North Charleston, South Carolina 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

469
FXUS62 KCHS 171825
AFDCHS

Area Forecast Discussion
National Weather Service Charleston SC
225 PM EDT Fri Jul 17 2026

.WHAT HAS CHANGED...
All sections were updated.

&&

.KEY MESSAGES...
- 1) Hot and humid conditions are expected across the area this
  weekend and through early next week. Heat Advisories could be
  needed.

&&

.DISCUSSION...
KEY MESSAGE 1: Hot and humid conditions are expected across the
area this weekend and through early next week. Heat Advisories
could be needed.

Surface high pressure will persist across the western Atlantic
through the period, favoring southwest to south flow that will
support dew points well in the 70s and afternoon high
temperatures in the mid 90s each day. Widespread peak heat index
values above 100 degrees are expected daily across southeast
South Carolina and southeast Georgia. A swath of 105 to near 110
degree heat indices are possible along and east of the I-95
corridor where dew points in the upper 70s and perhaps low 80s
could occur. The need for Heat Advisories in these locations
will likely be evaluated on a day-to- day basis through the
middle of next week.

Convective coverage could become more numerous next week as an
inland trough lingers nearby and a cold front approaches from
the northwest. Increased cloud cover and earlier thunderstorm
development could temper daytime heating if convection develops
during the peak heating hours.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
The 18z TAF period begins with VFR conditions at KCHS, KJZI,
and KSAV. The main forecast challenge will be thunderstorm
potential this afternoon along the sea breeze. Based on current
satellite imagery and hi-res model guidance, it appears the best
thunderstorm chances will be at KCHS and KSAV. Thunderstorm
development could occur around 19-20z and potentially last
through 21-22z. The main impact would be reduced visibility in
heavy rainfall, but gusty winds could occur as well depending on
how strong the storms become. As we get into the late afternoon
and the evening, thunderstorms should shift inland and no
longer be a threat to the terminals.

Extended Aviation Outlook: Predominately VFR conditions through
the period, however there is a low chance of brief flight
restrictions each afternoon and evening from showers and
thunderstorms developing along the sea breeze.

&&

.MARINE...
Tonight through Wednesday: The pattern will continue to feature
the subtropical high to the east and a trough inland. This
setup should favor moderate south to southwest flow each day,
with flow surging a bit each afternoon and evening with the
development of the sea breeze. During the peak surge each day,
winds will get into the 15- 20 knot range with gusts up to
around 25 knots possible primarily across the SC waters and in
Charleston Harbor. Seas should generally be in the 2-4 ft range,
except up to around 5 ft in response to surging winds across
the Charleston County waters. It`s possible we could need short
duration Small Craft Advisories at times, mainly in the
Charleston County waters and maybe even Charleston Harbor. The
National Hurricane Center continues to highlight an area in the
northeast Gulf with a low chance (30%) of development through
the next 7 days. If this low were to develop and track up the
Southeast coast, there could be additional wind and sea concerns
for the local waters.

&&

.CLIMATE...
Record High Minimum Temperatures:

July 17:
KCHS: 79/2025

July 18:
KCHS: 79/2007
KCXM: 81/2007

July 19:
KCHS: 79/1986
KCXM: 83/1986

July 20:
KCHS: 79/2025
KCXM: 83/2000
KSAV: 79/1942

July 21:
KCHS: 80/1986
KCXM: 83/1998

July 22:
KCHS: 81/2011
KCXM: 83/2011

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...Heat Advisory until 7 PM EDT this evening for SCZ045-150-152.
MARINE...None.

&&

$$

BRS/BSH