National Weather Service Forecast for: Port Royal SC
Issued by: National Weather Service Charleston, SC
Updated: 8:32 pm EDT Jun 18, 2026
 
Tonight

Tonight: A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 76. South wind 9 to 13 mph, with gusts as high as 24 mph.
Chance
Showers

 Juneteenth

Juneteenth: Showers and thunderstorms likely before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 90. Heat index values as high as 102. Breezy, with a west wind 15 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely and
Breezy then
Chance
T-storms
 Friday
Night
Friday Night: A slight chance of showers and thunderstorms before 2am, then a slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 76. West wind 6 to 8 mph. Chance of precipitation is 20%.
Slight Chance
T-storms

 Saturday

Saturday: A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91. Northwest wind around 6 mph becoming east in the afternoon.
Partly Sunny
then Chance
T-storms

 Saturday
Night
Saturday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 75. Light south wind.
Chance
T-storms then
Partly Cloudy

 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 92.
Partly Sunny
then Slight
Chance
T-storms
 Sunday
Night
Sunday Night: Partly cloudy, with a low around 77.
Partly Cloudy


 Monday

Monday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94.
Mostly Sunny
then Slight
Chance
T-storms
 Monday
Night
Monday Night: Partly cloudy, with a low around 78.
Partly Cloudy
Lo 76 °F Hi 90 °F Lo 76 °F Hi 91 °F Lo 75 °F Hi 92 °F Lo 77 °F Hi 94 °F Lo 78 °F

 

Tonight
 
 A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 76. South wind 9 to 13 mph, with gusts as high as 24 mph.
Juneteenth
 
 Showers and thunderstorms likely before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 90. Heat index values as high as 102. Breezy, with a west wind 15 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
 
 A slight chance of showers and thunderstorms before 2am, then a slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 76. West wind 6 to 8 mph. Chance of precipitation is 20%.
Saturday
 
 A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91. Northwest wind around 6 mph becoming east in the afternoon.
Saturday Night
 
 A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 75. Light south wind.
Sunday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 92.
Sunday Night
 
 Partly cloudy, with a low around 77.
Monday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94.
Monday Night
 
 Partly cloudy, with a low around 78.
Tuesday
 
 A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 95.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Wednesday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Thursday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.

 

Forecast from NOAA-NWS for Port Royal SC.