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

81°F

27°C

Humidity 94%
Wind Speed Calm
Barometer 29.94 in
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 20 Aug 3:35 am EDT
Extended Forecast for

5 Miles NNW Johns Island SC

Heat Advisory August 20, 11:00am until August 20, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Clear, with a low around 79. Calm wind.

    Low: 79 °F

    Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly between 2pm and 4pm. Sunny, with a high near 96. Heat index values as high as 110. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 96 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 79. South wind 3 to 6 mph.

    Low: 79 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Increasing clouds, with a high near 95. Heat index values as high as 109. Light southwest wind becoming south 5 to 10 mph in the afternoon.

    High: 95 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 77. South wind 5 to 9 mph becoming light southwest after midnight. New rainfall amounts between a quarter and half of an inch possible.

    Low: 77 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 93 °F

    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%.

    Low: 76 °F

    T-storms
    Likely

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 94.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

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

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 79. Calm wind.
Thursday
A 30 percent chance of showers and thunderstorms, mainly between 2pm and 4pm. Sunny, with a high near 96. Heat index values as high as 110. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 79. South wind 3 to 6 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Increasing clouds, with a high near 95. Heat index values as high as 109. Light southwest wind becoming south 5 to 10 mph in the afternoon.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 77. South wind 5 to 9 mph becoming light southwest after midnight. 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 93. 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%.
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
Partly cloudy, with a low around 76.
Tuesday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 92.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Wednesday
A 40 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:
5 Miles NNW Johns Island SC
 32.78°N 80.12°W (Elev. 3 ft)
Last Update:
3:06 am EDT Aug 20, 2026
Forecast Valid:
3am 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