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NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

80°F

27°C

Humidity 62%
Wind Speed S 17 G 25 mph
Barometer 29.89 in (1011.9 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 17 May 10:53 am CDT
Extended Forecast for

Mascoutah IL

  • Today

    Today: Mostly cloudy early, then gradual clearing, with a high near 89. Breezy, with a south wind 15 to 20 mph.

    High: 89 °F

    Becoming
    Sunny and
    Breezy

  • Tonight

    Tonight: Increasing clouds, with a low around 73. South wind 13 to 15 mph, with gusts as high as 24 mph.

    Low: 73 °F

    Increasing
    Clouds

  • Monday

    Monday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 88. Breezy, with a south wind 15 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 88 °F

    Breezy.
    Chance
    Showers then
    T-storms
    Likely

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. South wind 14 to 16 mph, with gusts as high as 24 mph.

    Low: 71 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 87. South wind 11 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    High: 87 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 59. Chance of precipitation is 80%.

    Low: 59 °F

    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 72.

    High: 72 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy early, then gradual clearing, with a high near 89. Breezy, with a south wind 15 to 20 mph.
Tonight
Increasing clouds, with a low around 73. South wind 13 to 15 mph, with gusts as high as 24 mph.
Monday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 88. Breezy, with a south wind 15 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. South wind 14 to 16 mph, with gusts as high as 24 mph.
Tuesday
Showers and possibly a thunderstorm. High near 87. South wind 11 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 59. Chance of precipitation is 80%.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 72.
Wednesday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 53.
Thursday
Partly sunny, with a high near 73.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 56.
Friday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 60.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mascoutah IL
 38.5°N 89.78°W (Elev. 440 ft)
Last Update:
8:46 am CDT May 17, 2026
Forecast Valid:
11am CDT May 17, 2026-6pm CDT May 23, 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