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.

A Few Clouds

89°F

32°C

Humidity 48%
Wind Speed Vrbl 3 mph
Barometer 30.22 in (1022.9 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 6 Aug 1:53 pm CDT
Extended Forecast for

Collinsville IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 90. Light southeast wind.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: A slight chance of showers between 1am and 2am. Mostly clear, with a low around 71. Light southeast wind. Chance of precipitation is 20%.

    Low: 71 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 92. Calm wind becoming south around 6 mph in the morning.

    High: 92 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 72. Southeast wind 5 to 7 mph.

    Low: 72 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 94. South wind 5 to 9 mph.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 90. Light southeast wind.
Tonight
A slight chance of showers between 1am and 2am. Mostly clear, with a low around 71. Light southeast wind. Chance of precipitation is 20%.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 92. Calm wind becoming south around 6 mph in the morning.
Thursday Night
Partly cloudy, with a low around 72. Southeast wind 5 to 7 mph.
Friday
Sunny, with a high near 94. South wind 5 to 9 mph.
Friday Night
Mostly clear, with a low around 74.
Saturday
Sunny, with a high near 94.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Mostly sunny, with a high near 92.
Sunday Night
Partly cloudy, with a low around 75.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collinsville IL
 38.68°N 90°W (Elev. 499 ft)
Last Update:
2:31 pm CDT Aug 6, 2025
Forecast Valid:
2pm CDT Aug 6, 2025-6pm CDT Aug 12, 2025
 
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