National Weather Service Forecast for: Port Royal SC
Issued by: National Weather Service Charleston, SC
Updated: 3:06 am EDT Aug 20, 2026
 
Today

Today: Sunny, with a high near 95. Heat index values as high as 109. Calm wind becoming south 5 to 7 mph in the afternoon.
Sunny

 Tonight

Tonight: Mostly clear, with a low around 79. South wind 3 to 7 mph.
Mostly Clear

 Friday

Friday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Light southwest wind becoming south 5 to 9 mph in the afternoon.
Mostly Sunny
then Chance
T-storms
 Friday
Night
Friday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Southwest wind 3 to 8 mph.
Chance
T-storms

 Saturday

Saturday: Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 93. Southwest wind 5 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Slight Chance
T-storms then
T-storms
Likely
 Saturday
Night
Saturday Night: Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
T-storms
Likely

 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 94.
Sunny then
Slight Chance
T-storms
 Sunday
Night
Sunday Night: Mostly clear, with a low around 76.
Mostly Clear

 Monday

Monday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 93.
Sunny then
Slight Chance
T-storms
Hi 95 °F Lo 79 °F Hi 94 °F Lo 77 °F Hi 93 °F Lo 76 °F Hi 94 °F Lo 76 °F Hi 93 °F

Heat Advisory
 

Today
 
 Sunny, with a high near 95. Heat index values as high as 109. Calm wind becoming south 5 to 7 mph in the afternoon.
Tonight
 
 Mostly clear, with a low around 79. South wind 3 to 7 mph.
Friday
 
 A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Light southwest wind becoming south 5 to 9 mph in the afternoon.
Friday Night
 
 A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Southwest wind 3 to 8 mph.
Saturday
 
 Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 93. Southwest wind 5 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
 
 Showers and thunderstorms likely, mainly before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 94.
Sunday Night
 
 Mostly clear, with a low around 76.
Monday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 93.
Monday Night
 
 Mostly clear, with a low around 76.
Tuesday
 
 A 30 percent chance of showers and thunderstorms. Sunny, with a high near 92.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Wednesday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

 

Forecast from NOAA-NWS for Port Royal SC.