National Weather Service Forecast for: Myrtle Beach SC
Issued by: National Weather Service Wilmington, NC
Updated: 3:00 am EDT Aug 20, 2026
 
Today

Today: Sunny, with a high near 88. Heat index values as high as 102. Calm wind becoming south 5 to 9 mph in the afternoon.
Sunny

 Tonight

Tonight: Partly cloudy, with a low around 80. South wind 6 to 8 mph.
Partly Cloudy

 Friday

Friday: A chance of showers and thunderstorms, mainly between 2pm and 5pm. Mostly sunny, with a high near 87. Heat index values as high as 103. Light south wind increasing to 8 to 13 mph in the morning. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Mostly Sunny
then Chance
T-storms
 Friday
Night
Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 77. Southwest wind 7 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely
 Saturday

Saturday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 86. Southwest wind 6 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Showers
 Saturday
Night
Saturday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms, mainly between 8pm and 2am. Low around 76. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers then
Chance
T-storms
 Sunday

Sunday: Mostly sunny, with a high near 86.
Mostly Sunny

 Sunday
Night
Sunday Night: Mostly clear, with a low around 76.
Mostly Clear

 Monday

Monday: Sunny, with a high near 85.
Sunny
Hi 88 °F Lo 80 °F Hi 87 °F Lo 77 °F Hi 86 °F Lo 76 °F Hi 86 °F Lo 76 °F Hi 85 °F

Heat Advisory
 

Today
 
 Sunny, with a high near 88. Heat index values as high as 102. Calm wind becoming south 5 to 9 mph in the afternoon.
Tonight
 
 Partly cloudy, with a low around 80. South wind 6 to 8 mph.
Friday
 
 A chance of showers and thunderstorms, mainly between 2pm and 5pm. Mostly sunny, with a high near 87. Heat index values as high as 103. Light south wind increasing to 8 to 13 mph in the morning. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 77. Southwest wind 7 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
 
 A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 86. Southwest wind 6 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
 
 Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms, mainly between 8pm and 2am. Low around 76. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
 
 Mostly sunny, with a high near 86.
Sunday Night
 
 Mostly clear, with a low around 76.
Monday
 
 Sunny, with a high near 85.
Monday Night
 
 Partly cloudy, with a low around 76.
Tuesday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
Tuesday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Chance of precipitation is 40%.
Wednesday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Myrtle Beach SC.