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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

47°F

8°C

Humidity 44%
Wind Speed N 12 mph
Barometer 30.56 in (1035.0 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 27 Mar 8:53 pm CDT
Extended Forecast for

Mascoutah IL

Freeze Warning March 28, 01:00am until March 28, 09:00am
Click here for hazard details and duration
Freeze Warning

  • Tonight

    Tonight: Widespread frost after 4am. Otherwise, mostly clear, with a low around 29. North wind 5 to 10 mph.

    Low: 29 °F

    Mostly Clear
    then Frost

  • Saturday

    Saturday: Widespread frost before 9am. Otherwise, sunny, with a high near 55. Calm wind becoming south 5 to 7 mph in the morning.

    High: 55 °F

    Frost then
    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 39. South wind around 6 mph.

    Low: 39 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 67. South wind 6 to 15 mph, with gusts as high as 22 mph.

    High: 67 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 55. South wind around 10 mph.

    Low: 55 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain and thunderstorms after 1pm. Mostly sunny, with a high near 83. Breezy.

    High: 83 °F

    Breezy.
    Mostly Sunny
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: A chance of rain, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 50. Chance of precipitation is 70%.

    Low: 50 °F

    Chance Rain
    then Rain
    Likely

Detailed Forecast

Tonight
Widespread frost after 4am. Otherwise, mostly clear, with a low around 29. North wind 5 to 10 mph.
Saturday
Widespread frost before 9am. Otherwise, sunny, with a high near 55. Calm wind becoming south 5 to 7 mph in the morning.
Saturday Night
Increasing clouds, with a low around 39. South wind around 6 mph.
Sunday
Partly sunny, with a high near 67. South wind 6 to 15 mph, with gusts as high as 22 mph.
Sunday Night
Partly cloudy, with a low around 55. South wind around 10 mph.
Monday
Mostly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 65.
Tuesday
A 30 percent chance of rain and thunderstorms after 1pm. Mostly sunny, with a high near 83. Breezy.
Tuesday Night
A chance of rain, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 50. Chance of precipitation is 70%.
Wednesday
Rain likely and possibly a thunderstorm before 1pm, then a chance of rain and thunderstorms after 1pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Wednesday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Thursday
Rain and thunderstorms likely. Mostly cloudy, with a high near 56. Chance of precipitation is 60%.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 47.
Friday
A 40 percent chance of rain and thunderstorms. Partly sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mascoutah IL
 38.52°N 89.81°W (Elev. 423 ft)
Last Update:
9:26 pm CDT Mar 27, 2026
Forecast Valid:
9pm CDT Mar 27, 2026-6pm CDT Apr 3, 2026
 
Forecast Discussion
 
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Additional Resources

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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