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Hazardous Weather Conditions

Current conditions at

Charleston Executive Airport (KJZI)

Lat: 32.7°NLon: 80°WElev: 16ft.

Fair

82°F

28°C

Humidity 89%
Wind Speed Calm
Barometer 29.97 in
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 20 Aug 7:35 am EDT
Extended Forecast for

3 Miles E Johns Island SC

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

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Heat index values as high as 109. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 93 °F

    Sunny then
    Slight Chance
    T-storms

  • Tonight

    Tonight: 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, mainly after 3pm. Mostly sunny, with a high near 92. Heat index values as high as 108. Light southwest wind becoming south 8 to 13 mph in the morning.

    High: 92 °F

    Mostly Sunny
    then 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 77. Southwest wind 6 to 9 mph. 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 91. Light southwest wind increasing to 6 to 11 mph in the morning. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 91 °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%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 76 °F

    T-storms
    Likely

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 91.

    High: 91 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Heat index values as high as 109. Calm wind becoming south 5 to 9 mph in the afternoon.
Tonight
Mostly clear, with a low around 80. South wind 5 to 7 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 92. Heat index values as high as 108. Light southwest wind becoming south 8 to 13 mph in the morning.
Friday Night
A 50 percent chance of showers and thunderstorms. Cloudy, then gradually becoming partly cloudy, with a low around 77. Southwest wind 6 to 9 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 91. Light southwest wind increasing to 6 to 11 mph in the morning. Chance of precipitation is 70%. 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 76. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91.
Sunday Night
Partly cloudy, with a low around 77.
Monday
A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 91.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Wednesday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 90.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Johns Island SC
 32.73°N 80.01°W (Elev. 3 ft)
Last Update:
3:06 am EDT Aug 20, 2026
Forecast Valid:
8am EDT Aug 20, 2026-6pm EDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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