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

Salem, Salem-Leckrone Airport (KSLO)

Lat: 38.64°NLon: 88.96°WElev: 574ft.

Fair

56°F

13°C

Humidity 68%
Wind Speed N 8 mph
Barometer 29.94 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 15 Feb 2:55 pm CST
Extended Forecast for

Vandalia IL

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 37. Calm wind.

    Low: 37 °F

    Mostly Clear
    then Patchy
    Fog

  • Washington's Birthday

    Washington's Birthday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 61. Light south wind increasing to 5 to 10 mph in the morning.

    High: 61 °F

    Patchy Fog
    then Partly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. South wind around 7 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 60. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 60 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 55. Breezy, with a south wind 15 to 21 mph, with gusts as high as 31 mph.

    Low: 55 °F

    Breezy.
    Cloudy then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 70. Chance of precipitation is 30%.

    High: 70 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 38.

    Low: 38 °F

    Chance
    Showers then
    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 37. Calm wind.
Washington's Birthday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 61. Light south wind increasing to 5 to 10 mph in the morning.
Monday Night
Mostly cloudy, with a low around 41. South wind around 7 mph.
Tuesday
Cloudy, with a high near 60. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 25 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 55. Breezy, with a south wind 15 to 21 mph, with gusts as high as 31 mph.
Wednesday
Sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 70. Chance of precipitation is 30%.
Thursday Night
A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 38.
Friday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 51.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30.
Saturday
A 20 percent chance of rain. Partly sunny, with a high near 47.
Saturday Night
A slight chance of rain and snow. Partly cloudy, with a low around 26. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Vandalia IL
 38.96°N 89.11°W (Elev. 531 ft)
Last Update:
2:46 pm CST Feb 15, 2026
Forecast Valid:
3pm CST Feb 15, 2026-6pm CST Feb 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