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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

72°F

22°C

Humidity 79%
Wind Speed Calm
Barometer 29.88 in (1011.6 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 16 May 11:53 pm CDT
Extended Forecast for

Mascoutah IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 67. South wind 5 to 7 mph.

    Low: 67 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 89. South wind 9 to 18 mph, with gusts as high as 26 mph.

    High: 89 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 71. South wind 13 to 15 mph, with gusts as high as 23 mph.

    Low: 71 °F

    Increasing
    Clouds

  • Monday

    Monday: A chance of showers and thunderstorms before 11am, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 88. South wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 50%.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. South wind 13 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. Chance of precipitation is 90%.

    High: 87 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 61. Chance of precipitation is 80%.

    Low: 61 °F

    Showers

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 73. Chance of precipitation is 20%.

    High: 73 °F

    Slight Chance
    T-storms

  • Wednesday Night

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

    Low: 53 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 67. South wind 5 to 7 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 89. South wind 9 to 18 mph, with gusts as high as 26 mph.
Sunday Night
Increasing clouds, with a low around 71. South wind 13 to 15 mph, with gusts as high as 23 mph.
Monday
A chance of showers and thunderstorms before 11am, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 88. South wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 50%.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. 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. Chance of precipitation is 90%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 61. Chance of precipitation is 80%.
Wednesday
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 73. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 53.
Thursday
Partly sunny, with a high near 71.
Thursday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 75.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 58.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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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:
11:51 pm CDT May 16, 2026
Forecast Valid:
12am 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