Fort Mill, South Carolina 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Fort Mill SC
National Weather Service Forecast for:
Fort Mill SC
Issued by: National Weather Service Greenville-Spartanburg, SC |
Updated: 8:19 pm EDT Jul 26, 2025 |
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Tonight
 Mostly Clear
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Sunday
 Hot
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Sunday Night
 Mostly Clear
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Monday
 Sunny then Chance T-storms
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Monday Night
 Chance T-storms
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Tuesday
 Mostly Sunny then Slight Chance T-storms
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Tuesday Night
 Chance T-storms then Partly Cloudy
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Wednesday
 Partly Sunny then Chance T-storms
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Wednesday Night
 Chance T-storms
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Lo 76 °F |
Hi 100 °F |
Lo 78 °F |
Hi 100 °F |
Lo 77 °F |
Hi 97 °F |
Lo 75 °F |
Hi 96 °F |
Lo 75 °F |
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Hazardous Weather Outlook
Heat Advisory
Tonight
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Mostly clear, with a low around 76. Calm wind. |
Sunday
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Sunny and hot, with a high near 100. Heat index values as high as 109. Light north wind. |
Sunday Night
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Mostly clear, with a low around 78. Calm wind. |
Monday
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A 30 percent chance of showers and thunderstorms, mainly after 5pm. Sunny and hot, with a high near 100. Heat index values as high as 108. North wind 3 to 5 mph. |
Monday Night
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A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Partly cloudy, with a low around 77. Calm wind. Chance of precipitation is 30%. |
Tuesday
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A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 97. |
Tuesday Night
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A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 75. |
Wednesday
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A 30 percent chance of showers and thunderstorms after 3pm. Partly sunny and hot, with a high near 96. |
Wednesday Night
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A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. |
Thursday
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A chance of showers between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 95. Chance of precipitation is 40%. |
Thursday Night
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A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. |
Friday
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Showers and thunderstorms likely. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 88. Chance of precipitation is 60%. |
Friday Night
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Showers and thunderstorms likely. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 68. Chance of precipitation is 70%. |
Saturday
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A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. |
Forecast from NOAA-NWS
for Fort Mill SC.
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Weather Forecast Discussion
189
FXUS62 KGSP 262327
AFDGSP
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
727 PM EDT Sat Jul 26 2025
.SYNOPSIS...
Oppressive heat and humidity build through the weekend, and
continue through the first half of next week. Dangerous heat indices
are possible, especially Sunday through Wednesday. Afternoon showers
and thunderstorms will be isolated except in the North Carolina
mountains. A cold front will finally arrive late in the week,
bringing an increase in showers and storms as well as much-needed
relief from the heat.
&&
.NEAR TERM /THROUGH SUNDAY/...
As of 725 PM Saturday: Isolated to low end scattered convection will
linger early this evening across the mountains with an isolated
shower possible elsewhere. Convection should dissipate by midnight.
After a record setting day for CLT/GSP, temps and heat indices are
slowly coming down. Will allow the Heat Advisory to expire on time.
Otherwise, the Southeast will remain under the influence of an upper
anticyclone that will continue to drift W/SW, with the center of the
high expected to move into the Deep South by the end of the period.
Conditions will therefore remain hot across our area through the
near term. Min temps will again by around 5 degrees above climo.
Morning fog/low stratus should again develop within the favored
mountain valleys by daybreak.
Short term guidance agrees that low level thermal trough will nudge
east of the CWA tonight, with a weak NW/downslope flow expected
to encompass the entire area for tomorrow. This should add another
degree or two to our heating potential, with high temps expected to
reach 100 in many locations southeast of I-85. Deep mixing is again
expected to result in surface dewpoints dipping into the mid/upper
60s in most areas, but coverage of 105+ heat indices should be more
widespread tomorrow...while the cumulative effect of a couple of
days of high heat along with very warm/muggy nighttime conditions
will make the heat more impactful, even if some areas don`t quite
meet the 105 criteria. The Heat Advisory has been expanded to
include all area except for the mountains and the northern NC
foothills. In terms of diurnal convective potential...forecast
soundings look, at most, marginally more favorable for updraft
development Sunday afternoon. 20-40 PoPs are carried across the
mountains and portions of the foothills.
&&
.SHORT TERM /SUNDAY NIGHT THROUGH TUESDAY/...
As of 100 PM EDT Saturday...
Key Messages:
1) Heat Wave Continues with Heat Advisory Criteria, and Possibly
Extreme Heat Warning Criteria, Each Afternoon East of the Mountains
2) Heat Index Values from 105 to 110+ Degrees F During Peak Heating
Each Day East of the Mountains
3) Diurnal Shower and Thunderstorm Chances will be Highest Across
the Mountains
The heat and humidity will be the main concern through the short
term as the heat wave lingers thanks to a large, hot upper
anticyclone continuing to building over the south-central CONUS
through Monday before stalling over the region on Tuesday.
Highs each afternoon east of the mountains will climb into the mid
90s to lower 100s. Dangerous indices are expected to develop east of
the mountains, ranging from 105-110+ degrees F each day during peak
heating. Thus, Heat Advisories are a good bet for early next week
for most locations east of the mountains. Extreme Heat Warning
criteria may be met for some locations east of the mountains (mainly
the Upper Savannah River Valley and areas along I-77) during peak
heating (mainly on Monday) so an Extreme Heat Watch may be needed if
confidence increases and if the trend of 110+ degrees F heat indices
holds. Highs across the mountain valleys will range from the upper
80s to lower 90s each day with higher elevations seeing highs range
from the mid 70s to mid 80s. Heat indices will reach into the upper
90s to lower 100s across the mountain valleys during peak heating
each day. There will not be much relief from the heat during the
overnight hours east of the mountains through the short term,
especially for those without access to air conditioning, thanks to
lows only falling into the mid to upper 70s. Limit strenuous outdoor
activities from 11 AM to 8 PM each day, stay hydrated, never leave
people or pets unattended in a locked car (look before you lock!),
and make sure to check on those more vulnerable to the heat
(elderly, sick, and those without access to AC). If you have to work
outside take frequent breaks in the shade, stay hydrated, and
monitor for signs of heat illness.
As for diurnal convective chances, the NBM continues to have the
highest potential for activity across the mountains through the
short term. The one glimmer of hope for locations east of the
mountains is a shortwave that will dive across the western Carolinas
and northeast Georgia on Monday. This could increase convective
chances area-wide but the ridge may suppress activity somewhat.
&&
.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
As of 100 PM EDT Saturday...
Key Messages:
1) Heat Wave Lingers through Thursday with Heat Advisory Criteria
Possible Each Afternoon for Some Locations East of the Mountains
2) Much Cooler Temperatures Return Behind a Cold Front Friday into
Saturday, with Below Normal Highs Expected on Saturday
3) Shower and Thunderstorm Chances Increase Area-Wide Thursday into
Saturday with the Front
The hot upper anticyclone gradually breaks down through the long
term as a potent (for summer) upper trough digs across the
northeastern United States. So, although the heat wave will continue
through Thursday, the heat and humidity will start ticking down each
day through the long term, with much needed relief finally arriving
Friday into Saturday. So although it will be a hot (and arguably
miserable) end to July, it will be a nice and (arguably refreshing)
start to August!
A cooling trend is expected throughout the long term in regards to
both high and low temperatures. Highs will start out ranging from
the low to mid 90s east of the mountains each afternoon on Wednesday
and Thursday before dipping down into the lower 80s to lower 90s
Friday into Saturday behind a cold front. Heat index values may
climb near or even reach Heat Advisory criteria (mainly across the
Upper Savannah River Valley and along/near I-77) during peak heating
on Wednesday and Thursday (but especially on Wednesday). Lows east
of the mountains will be noticeably cooler as well, dipping into the
mid 60s to lower 70s starting Friday night. Highs each afternoon
across the mountains will range from the lower 70s to upper 80s on
Wednesday and Thursday before dipping down into the lower 60s to
lower 80s Friday and Saturday. Lows across the mountains will drop
into the mid 50s to mid 60s by Friday night.
As for convective chances, the NBM has the highest PoPs confined to
the mountains again on Wednesday but has PoPs increasing area-wide
starting Thursday ahead of the cold front. NBM then depicts PoPs
increasing further Friday ahead of and along the front, potentially
lingering into Saturday behind the front. Although shear increases
slightly with the front, cold air damming looks to develop towards
the end of the period. Thus, the severe weather threat should remain
low thanks to the wedge keeping us stable.
&&
.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
At KCLT and elsewhere: Convection has limited mainly to the
mountains, but an isolated shower can`t be ruled out elsewhere early
this evening. Kept a VCSH at KAVL with no mentions elsewhere. VFR
cumulus and patchy convective debris should dissipate through the
evening. Mountain valley fog and low stratus is again anticipated,
but primarily in the valleys west of KAVL...so VFR is forecast to
prevail at all TAF sites through the period. Winds will vary from SW
to NW across the area this evening with light NW or light and
variable winds overnight. N to NW wind picks back up during the day
Sunday trending to more S to NW for the afternoon. Mountains have
the best chance for afternoon convection, so PROB30 limited to KAVL
for now. Scattered VFR cumulus expected for most locations again.
Outlook: Typical mid-summer weather is expected to continue thru at
least the middle of next week, with scattered to numerous diurnal
convection in the mountains, and isolated to scattered convection in
the Piedmont. Low stratus and/or fog will be possible each
morning...mainly in the mtn valleys.
&&
.CLIMATE...
RECORDS FOR 07-27
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 97 1952 70 1946 72 1936 48 1911
1925
KCLT 103 1940 74 1926 76 2022 57 1920
2016
1944
KGSP 103 1940 70 1946 75 2012 54 1911
1944
RECORDS FOR 07-28
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 98 1952 68 1890 70 2010 53 1895
1878
1877
KCLT 102 1952 70 1890 78 2016 54 1962
KGSP 103 1952 72 1926 76 2016 60 1911
1936 1904
RECORDS FOR 07-29
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 98 1952 67 1984 74 1877 55 1911
1895
KCLT 103 1952 72 1984 77 1993 59 1920
KGSP 104 1952 70 1984 76 1949 59 1911
1936
RECORDS FOR 07-30
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 93 1954 68 1936 72 2011 54 2014
1878 1897
1895
KCLT 101 2011 71 1981 77 1953 58 1914
1941
KGSP 101 1999 73 1981 77 2011 60 1914
1911
1884
RECORDS FOR 07-31
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 95 1999 65 1936 71 2011 53 1986
1914
KCLT 100 1999 69 1936 77 1941 56 1914
1931 1931
1915
KGSP 104 1999 71 2014 78 1999 56 1936
1931
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...Heat Advisory from noon Sunday to 2 AM EDT Monday for GAZ018-
026-028-029.
Heat Advisory until 8 PM EDT this evening for GAZ028-029.
NC...Heat Advisory from noon Sunday to 2 AM EDT Monday for NCZ036-
037-056-057-068>072-082-508-510.
Heat Advisory until 8 PM EDT this evening for NCZ036-037-056-
057-069>072-082.
SC...Heat Advisory from noon Sunday to 2 AM EDT Monday for
SCZ008>014-019-104>109.
Heat Advisory until 8 PM EDT this evening for SCZ009>014-019-
107-109.
&&
$$
SYNOPSIS...AR
NEAR TERM...JDL/RWH
SHORT TERM...AR
LONG TERM...AR
AVIATION...RWH
CLIMATE...
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