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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.

A Few Clouds

73°F

23°C

Humidity 74%
Wind Speed Vrbl 7 mph
Barometer 29.93 in (1013.0 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 17 May 7:53 am CDT
Extended Forecast for

Mascoutah IL

  • Today

    Today: Sunny, with a high near 89. South wind 11 to 18 mph, with gusts as high as 26 mph.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 73. South wind 11 to 15 mph, with gusts as high as 23 mph.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 88. South wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 88 °F

    Chance
    Showers then
    T-storms
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 71. South wind 13 to 16 mph, with gusts as high as 24 mph.

    Low: 71 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 87. South wind 11 to 16 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
Sunny, with a high near 89. South wind 11 to 18 mph, with gusts as high as 26 mph.
Tonight
Partly cloudy, with a low around 73. South wind 11 to 15 mph, with gusts as high as 23 mph.
Monday
Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 88. South wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 71. South wind 13 to 16 mph, with gusts as high as 24 mph.
Tuesday
Showers and possibly a thunderstorm. High near 87. South wind 11 to 16 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
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mascoutah IL
 38.5°N 89.81°W (Elev. 427 ft)
Last Update:
4:26 am CDT May 17, 2026
Forecast Valid:
8am 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