National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

3 Miles ESE Collinsville IL

  • Overnight

    Overnight: Clear, with a low around 46. South wind around 8 mph.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 80. South wind 8 to 16 mph, with gusts as high as 24 mph.

    High: 80 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60. South wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of rain and thunderstorms before 1pm, then a chance of rain between 1pm and 4pm, then a chance of rain and thunderstorms after 4pm. Increasing clouds, with a high near 81. South wind 7 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    High: 81 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 56. Southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    Low: 56 °F

    Rain Likely
    then Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. Temperature rising to near 64 by 10am, then falling to around 49 during the remainder of the day. Breezy. Chance of precipitation is 100%.

    High: 64 °F⇓

    Rain and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 34. Breezy.

    Low: 34 °F

    Mostly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Thursday

    Thursday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 46. South wind around 8 mph.
Monday
Sunny, with a high near 80. South wind 8 to 16 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 60. South wind 8 to 13 mph, with gusts as high as 21 mph.
Tuesday
A slight chance of rain and thunderstorms before 1pm, then a chance of rain between 1pm and 4pm, then a chance of rain and thunderstorms after 4pm. Increasing clouds, with a high near 81. South wind 7 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 56. Southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Wednesday
Rain and possibly a thunderstorm. Temperature rising to near 64 by 10am, then falling to around 49 during the remainder of the day. Breezy. Chance of precipitation is 100%.
Wednesday Night
Mostly cloudy, with a low around 34. Breezy.
Thursday
Sunny, with a high near 53.
Thursday Night
Mostly cloudy, with a low around 44.
Friday
Partly sunny, with a high near 63.
Friday Night
Mostly cloudy, with a low around 39.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 50.
Sunday
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a high near 68. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Collinsville IL
 38.68°N 89.95°W (Elev. 548 ft)
Last Update:
1:26 am CDT Mar 9, 2026
Forecast Valid:
3am CDT Mar 9, 2026-6pm CDT Mar 15, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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