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Hazardous Weather Conditions

Current conditions at

Summerville Airport (KDYB)

Lat: 33.06°NLon: 80.28°WElev: 56ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Harleyville SC

Heat Advisory August 16, 11:00am until August 16, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Partly cloudy, with a low around 75. Calm wind.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 97. Heat index values as high as 110. Calm wind.

    High: 97 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 76. Calm wind.

    Low: 76 °F

    Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 99. Heat index values as high as 109. Calm wind becoming west around 5 mph in the afternoon.

    High: 99 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. Light southwest wind.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100.

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76.

    Low: 76 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 97.

    High: 97 °F

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 76.

    Low: 76 °F

    Chance
    T-storms then
    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 75. Calm wind.
Sunday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 97. Heat index values as high as 110. Calm wind.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 76. Calm wind.
Monday
Sunny, with a high near 99. Heat index values as high as 109. Calm wind becoming west around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 78. Light southwest wind.
Tuesday
Sunny and hot, with a high near 100.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76.
Wednesday
A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 97.
Wednesday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 76.
Thursday
A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 98.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Friday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Friday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harleyville SC
 33.22°N 80.44°W (Elev. 85 ft)
Last Update:
8:40 pm EDT Aug 15, 2026
Forecast Valid:
12am EDT Aug 16, 2026-6pm EDT Aug 22, 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