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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.

Light Rain

77°F

25°C

Humidity 82%
Wind Speed N 10 mph
Barometer 29.93 in (1013.2 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 16 May 1:53 pm CDT
Extended Forecast for

Mascoutah IL

  • This Afternoon

    This Afternoon: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 79. South wind around 10 mph.

    High: 79 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, with a low around 66. Southeast wind 6 to 9 mph.

    Low: 66 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 87. South wind 10 to 18 mph, with gusts as high as 26 mph.

    High: 87 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 70. South wind 11 to 16 mph, with gusts as high as 23 mph.

    Low: 70 °F

    Increasing
    Clouds

  • Monday

    Monday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. South wind 14 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 88 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 88. Chance of precipitation is 80%.

    High: 88 °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

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 79. South wind around 10 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, with a low around 66. Southeast wind 6 to 9 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 87. South wind 10 to 18 mph, with gusts as high as 26 mph.
Sunday Night
Increasing clouds, with a low around 70. South wind 11 to 16 mph, with gusts as high as 23 mph.
Monday
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. South wind 14 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71.
Tuesday
Showers and possibly a thunderstorm. High near 88. Chance of precipitation is 80%.
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.
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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:
1:46 pm CDT May 16, 2026
Forecast Valid:
2pm CDT May 16, 2026-6pm CDT May 22, 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