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.

Fair

79°F

26°C

Humidity 58%
Wind Speed S 13 G 24 mph
Barometer 29.92 in (1012.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 3 Apr 5:53 pm CDT
Extended Forecast for

Collinsville IL

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 60. South wind 13 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.

    Low: 60 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 11am, then a slight chance of showers between 11am and 1pm. Temperature falling to around 55 by noon. West wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

    High: 63 °F⇓

    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39. West wind 8 to 15 mph, with gusts as high as 24 mph.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58. Northwest wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 40. West wind 3 to 6 mph.

    Low: 40 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 60. South wind 13 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.
Saturday
Showers and possibly a thunderstorm before 11am, then a slight chance of showers between 11am and 1pm. Temperature falling to around 55 by noon. West wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
Saturday Night
Mostly clear, with a low around 39. West wind 8 to 15 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 58. Northwest wind 8 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 40. West wind 3 to 6 mph.
Monday
Sunny, with a high near 62.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 37.
Tuesday
Mostly cloudy, with a high near 55.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 71.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 75.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Collinsville IL
 38.7°N 90°W (Elev. 499 ft)
Last Update:
5:36 pm CDT Apr 3, 2026
Forecast Valid:
6pm CDT Apr 3, 2026-6pm CDT Apr 10, 2026
 
Forecast Discussion
 
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Additional Resources

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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