Hazardous Weather Conditions
Current conditions at
Charleston Executive Airport (KJZI)
Lat: 32.7°NLon: 80°WElev: 16ft.
Fair
95°F
35°C
| Humidity | 47% |
| Wind Speed | NW 9 mph |
| Barometer | 29.94 in |
| Dewpoint | 72°F (22°C) |
| Visibility | 10.00 mi |
| Heat Index | 103°F (39°C) |
| Last update | 18 Aug 12:15 pm EDT |
Extended Forecast for
Johns Island SC
Extreme Heat Warning until August 18, 08:00pm
NOW until 8:00pm Tue

Extreme Heat Warning
This Afternoon

High: 99 °F
Slight Chance
T-stormsTonight

Low: 79 °F
Partly Cloudy
Wednesday

High: 96 °F
Sunny
Wednesday Night

Low: 80 °F
Mostly Clear
Thursday

High: 95 °F
Sunny
Thursday Night

Low: 80 °F
Mostly Clear
Friday

High: 94 °F
Sunny
Friday Night

Low: 78 °F
Chance
T-storms
Detailed Forecast
This Afternoon
A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 99. Heat index values as high as 118. Southwest wind 6 to 9 mph.
Tonight
Partly cloudy, with a low around 79. Southwest wind 3 to 8 mph.
Wednesday
Sunny, with a high near 96. Heat index values as high as 110. Calm wind becoming south 5 to 8 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 80. South wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 95. Calm wind becoming south 5 to 9 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 80.
Friday
Sunny, with a high near 94.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 2am. Partly cloudy, with a low around 78.
Saturday
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 60%.
Saturday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 77. Chance of precipitation is 60%.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Monday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Johns Island SC
32.73°N 80.07°W (Elev. 23 ft)
32.73°N 80.07°W (Elev. 23 ft)
8:32 am EDT Aug 18, 2026
12pm EDT Aug 18, 2026-6pm EDT Aug 24, 2026



