St. Charles, SC Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for St. Charles, SC.

1 Currently Active Alert for St. Charles

Current Conditions — Saint Charles, SC

SUMTER (KSMS)

Clear

69.8 F
Humidity:43%
Wind Speed:S 5.8 mph
Barometer:30.07 in
Dewpoint:46.4 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 22 2026, 08:15 PM EDT
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5-Day Forecast — Saint Charles, SC

Wednesday

High 84 °F
Smoke
Wednesday
Night
Low 55 °F
Clear
Thursday

High 87 °F
Smoke
Thursday
Night
Low 57 °F
Mostly Clear
Friday

High 89 °F
Mostly Sunny
Friday
Night
Low 59 °F
Mostly Clear
Saturday

High 89 °F
Chance of T-storms
Saturday
Night
Low 60 °F
Chance of T-storms
Sunday

High 80 °F
Chance of T-storms

Detailed Forecast — Saint Charles, SC

Wednesday
Smoke. High near 84°F. Wind 5 to 8 mph, with gusts as high as 16 mph.
Wednesday Night
Clear. Low around 55°F. Wind 3 to 5 mph, with gusts as high as 10 mph.
Thursday
Smoke. High near 87°F. Wind 2 to 3 mph, with gusts as high as 10 mph.
Thursday Night
Mostly Clear. Low around 57°F. Wind 2 to 5 mph, with gusts as high as 12 mph.
Friday
Mostly Sunny. High near 89°F. Wind 3 to 6 mph, with gusts as high as 15 mph.
Friday Night
Mostly Clear. Low around 59°F. Wind 3 to 5 mph, with gusts as high as 10 mph.
Saturday
Chance of Thunderstorms. High near 89°F. Wind 3 to 8 mph, with gusts as high as 15 mph.
Saturday Night
Chance of Thunderstorms. Low around 60°F. Wind 2 to 5 mph, with gusts as high as 10 mph.
Sunday
Chance of Thunderstorms. High near 80°F. Wind 5 to 8 mph, with gusts as high as 14 mph.
Sunday Night
Chance of Showers. Low around 55°F. Wind around 5 mph, with gusts as high as 10 mph.
Monday
Slight Chance of Rain Showers. High near 77°F. Wind 6 to 7 mph, with gusts as high as 13 mph.
Monday Night
Chance of Rain. Low around 59°F. Wind 3 to 5 mph, with gusts as high as 9 mph.
Tuesday
Chance of Thunderstorms. High near 84°F. Wind 6 to 9 mph, with gusts as high as 17 mph.
SC Radar
Current Radar • SC
Day 1 Outlook • April 23, 2026

Observation History — Saint Charles, SC

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
08:15 PM EDT S 5.8 10.00 Clear -- 69.8 46.4 43% NA NA 30.07 1018.3
07:55 PM EDT 5.8 10.00 Clear -- 73.4 46.4 38% NA 72.3 30.06 1018.0
07:35 PM EDT 5.8 10.00 Clear -- 77.0 46.4 34% NA 75.9 30.06 1018.0
07:15 PM EDT S 5.8 10.00 Clear -- 78.8 46.4 32% NA 77.9 30.06 1018.0
06:55 PM EDT 5.8 9.00 Clear -- 80.6 44.6 28% NA 79.7 30.07 1018.3
06:35 PM EDT 6.9 7.00 Clear -- 80.6 42.8 26% NA 79.5 30.07 1018.3
06:15 PM EDT 6.9 7.00 Clear -- 82.4 42.8 25% NA 80.4 30.07 1018.3
05:55 PM EDT 5.8 G 11.4 6.00 Haze -- 82.4 42.8 25% NA 80.4 30.07 1018.3
05:35 PM EDT 8.1 5.00 Haze -- 82.4 44.6 27% NA 80.4 30.08 1018.6
05:15 PM EDT 6.9 G 13.9 5.00 Haze -- 82.4 44.6 27% NA 80.4 30.08 1018.6
04:55 PM EDT 9.2 5.00 Haze -- 82.4 44.6 27% NA 80.4 30.09 1019.0
04:35 PM EDT SW 12.8 G 19.7 6.00 Haze -- 82.4 44.6 27% NA 80.4 30.09 1019.0
04:15 PM EDT 6.00 Haze -- 84.2 44.6 25% NA 81.7 30.10 1019.3
03:55 PM EDT SW 12.8 5.00 Haze -- 82.4 44.6 27% NA 80.4 30.12 1019.7
03:35 PM EDT 9.2 6.00 NULL -- 82.4 44.6 27% NA 80.4 30.12 1020.0
03:15 PM EDT W 8.1 7.00 Clear -- 82.4 44.6 27% NA 80.4 30.13 1020.3
02:55 PM EDT 9.2 G 15.0 9.00 Clear -- 82.4 46.4 28% NA 80.6 30.14 1020.7
02:35 PM EDT SW 11.4 10.00 Clear -- 80.6 46.4 30% NA 79.7 30.16 1021.3
02:15 PM EDT 6.9 G 15.0 10.00 Clear -- 80.6 46.4 30% NA 79.7 30.17 1021.7
01:55 PM EDT SW 8.1 G 16.1 10.00 Clear -- 80.6 46.4 30% NA 79.7 30.18 1022.0
01:35 PM EDT SW 9.2 G 16.1 10.00 Clear -- 80.6 46.4 30% NA 79.7 30.19 1022.4
12:55 PM EDT S 8.1 G 13.9 10.00 Clear -- 78.8 48.2 34% NA 77.9 30.20 1022.7
12:35 PM EDT SW 11.4 10.00 Clear -- 77.0 48.2 36% NA 76.1 30.22 1023.4
12:15 PM EDT SW 10.3 10.00 Clear -- 77.0 48.2 36% NA 76.1 30.23 1023.7

Regional Weather Observation

SUMTER (KSMS)

Clear
69.8 F

CAMDEN WOODWARD (KCDN)

Clear
77.0 F

HARTSVILLE (KHVS)

Clear
NULL F

LANCASTER (KLKR)

Clear
73.4 F

SHAW AFB/SUMTER (KSSC)

Clear
77.4 F

MCENTIRE ANG BAS (KMMT)

Clear
79.7 F
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