National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Salem, Salem-Leckrone Airport (KSLO)

Lat: 38.64°NLon: 88.96°WElev: 574ft.

31°C

87°F

Humidity 76%
Wind Speed NA
Barometer 30.02 in
Dewpoint 26°C (79°F)
Visibility 16 km
Heat Index38°C (101°F)
Last update 14 Aug 7:35 pm CDT
Extended Forecast for

Vandalia IL

Heat Advisory August 14, 07:44pm until August 16, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 14, 07:44pm until August 16, 09:00pm

    NOW until 9:00pm Sun

    Heat Advisory

  • Tonight

    Low: 24 °C

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 34. Heat index values as high as 41. Southwest wind 5 to 10 km/h.

    High: 34 °C

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 23. Southwest wind 3 to 8 km/h.

    Low: 23 °C

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 34. Heat index values as high as 39. West wind 5 to 11 km/h.

    High: 34 °C

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 21. Calm wind. Chance of precipitation is 50%.

    Low: 21 °C

    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 29.

    High: 29 °C

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 18.

    Low: 18 °C

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 30.

    High: 30 °C

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 24. Calm wind.
Saturday
Mostly sunny, with a high near 34. Heat index values as high as 41. Southwest wind 5 to 10 km/h.
Saturday Night
Mostly clear, with a low around 23. Southwest wind 3 to 8 km/h.
Sunday
Mostly sunny, with a high near 34. Heat index values as high as 39. West wind 5 to 11 km/h.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 21. Calm wind. Chance of precipitation is 50%.
Monday
Mostly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 18.
Tuesday
Sunny, with a high near 30.
Tuesday Night
Mostly clear, with a low around 21.
Wednesday
Mostly sunny, with a high near 32.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 20.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 29.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 18.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 28.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Vandalia IL
 38.96°N 89.11°W (Elev. 531 m)
Last Update:
5:36 pm CDT Aug 14, 2026
Forecast Valid:
7pm CDT Aug 14, 2026-6pm CDT Aug 21, 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