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.

Fair

84°F

29°C

Humidity 89%
Wind Speed Calm
Barometer 29.92 in
Dewpoint 81°F (27°C)
Visibility 9.00 mi
Heat Index98°F (37°C)
Last update 19 Aug 8:15 am EDT
Extended Forecast for

Johns Island SC

Heat Advisory August 19, 11:00am until August 19, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Sunny, with a high near 96. Heat index values as high as 112. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 96 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 80. South wind around 5 mph becoming calm in the evening.

    Low: 80 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 95. Heat index values as high as 112. Calm wind becoming southeast 5 to 9 mph in the afternoon.

    High: 95 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 80. South wind 5 to 7 mph.

    Low: 80 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 94. Light southwest wind becoming south 5 to 10 mph in the morning.

    High: 94 °F

    Sunny then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly before 2am. Partly cloudy, with a low around 78.

    Low: 78 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 92. Chance of precipitation is 60%.

    High: 92 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 76. Chance of precipitation is 60%.

    Low: 76 °F

    T-storms
    Likely

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

    High: 92 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 96. Heat index values as high as 112. Calm wind becoming south 5 to 8 mph in the afternoon.
Tonight
Mostly clear, with a low around 80. South wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 95. Heat index values as high as 112. Calm wind becoming southeast 5 to 9 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 80. South wind 5 to 7 mph.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 94. Light southwest wind becoming south 5 to 10 mph in the morning.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly before 2am. Partly cloudy, with a low around 78.
Saturday
Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 92. Chance of precipitation is 60%.
Saturday Night
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 76. Chance of precipitation is 60%.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Sunday Night
Partly cloudy, with a low around 78.
Monday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78.
Tuesday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Johns Island SC
 32.71°N 80.07°W (Elev. 10 ft)
Last Update:
8:32 am EDT Aug 19, 2026
Forecast Valid:
8am EDT Aug 19, 2026-6pm EDT Aug 25, 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