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

Heat Persists in the South Central U.S. and California; Heavy Rain in the Ohio Valley

Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >

Current conditions at

Salem, Salem-Leckrone Airport (KSLO)

Lat: 38.64°NLon: 88.96°WElev: 574ft.

Overcast

78°F

26°C

Humidity 74%
Wind Speed NA
Barometer 30.03 in
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 9 Sep 11:35 pm CDT
Extended Forecast for

3 Miles NW Vandalia IL

  • Tonight

    Tonight: Showers and thunderstorms before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Low around 69. Calm wind. Chance of precipitation is 90%.

    Low: 69 °F

    Heavy Rain

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 2pm. High near 79. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 90%.

    High: 79 °F

    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 82. Calm wind becoming east around 5 mph.

    High: 82 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Low around 69. Calm wind. Chance of precipitation is 90%.
Thursday
Showers and thunderstorms, mainly before 2pm. High near 79. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 90%.
Thursday Night
Mostly cloudy, with a low around 64. Calm wind.
Friday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 82. Calm wind becoming east around 5 mph.
Friday Night
Partly cloudy, with a low around 64. Calm wind.
Saturday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 88.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 66.
Sunday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 68.
Monday
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 70.
Tuesday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 90.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 66.
Wednesday
A 30 percent chance of showers. Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Vandalia IL
 39.01°N 89.13°W (Elev. 561 ft)
Last Update:
10:36 pm CDT Sep 9, 2026
Forecast Valid:
11pm CDT Sep 9, 2026-6pm CDT Sep 16, 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