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.

Overcast

72°F

22°C

Humidity 97%
Wind Speed N 3 mph
Barometer 30.02 in (1016.1 mb)
Dewpoint 71°F (22°C)
Visibility 7.00 mi
Last update 14 Jul 3:53 am CDT
Extended Forecast for

Collinsville IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 86. Calm wind becoming east around 6 mph in the afternoon.

    High: 86 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 70. Southeast wind 3 to 5 mph.

    Low: 70 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming southeast around 6 mph in the morning.

    High: 88 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74. South wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind 3 to 7 mph.

    High: 94 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 76.

    Low: 76 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.

    High: 94 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 75.

    Low: 75 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91.

    High: 91 °F

    Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 86. Calm wind becoming east around 6 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 70. Southeast wind 3 to 5 mph.
Tuesday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming southeast around 6 mph in the morning.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74. South wind around 5 mph becoming calm in the evening.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind 3 to 7 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 76.
Thursday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 75.
Friday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collinsville IL
 38.66°N 90°W (Elev. 499 ft)
Last Update:
4:21 am CDT Jul 14, 2025
Forecast Valid:
4am CDT Jul 14, 2025-6pm CDT Jul 20, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation