National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Charleston Executive Airport (KJZI)

Lat: 32.7°NLon: 80°WElev: 16ft.

Thunderstorm in Vicinity

93°F

34°C

Humidity 67%
Wind Speed S 8 mph
Barometer 30.00 in
Dewpoint 81°F (27°C)
Visibility 10.00 mi
Heat Index113°F (45°C)
Last update 20 Aug 1:35 pm EDT
Extended Forecast for

Sullivans Island SC

Heat Advisory until August 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until August 20, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 81. Southwest wind around 9 mph.

    Low: 81 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 108. South wind 6 to 14 mph.

    High: 90 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Cloudy, then gradually becoming partly cloudy, with a low around 79. Southwest wind 9 to 13 mph, with gusts as high as 20 mph. New rainfall amounts between a quarter and half of an inch possible.

    Low: 79 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 89. Southwest wind 6 to 14 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 78. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 78 °F

    T-storms
    Likely

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Chance of precipitation is 20%.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 78.

    Low: 78 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 90. Heat index values as high as 108. South wind around 9 mph.
Tonight
Mostly clear, with a low around 81. Southwest wind around 9 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 108. South wind 6 to 14 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Cloudy, then gradually becoming partly cloudy, with a low around 79. Southwest wind 9 to 13 mph, with gusts as high as 20 mph. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 89. Southwest wind 6 to 14 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 78. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A slight chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 78.
Monday
A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 89.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78.
Wednesday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivans Island SC
 32.76°N 79.85°W (Elev. 0 ft)
Last Update:
8:32 am EDT Aug 20, 2026
Forecast Valid:
2pm EDT Aug 20, 2026-6pm EDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation