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.

Fair

79°F

26°C

Humidity 74%
Wind Speed W 5 mph
Barometer 29.94 in (1013.3 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 5 Jul 7:53 pm CDT
Extended Forecast for

Madison ILSimilar City Names

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before midnight. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 70. Light north wind.

    Low: 70 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. North wind 3 to 8 mph.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. North wind 5 to 8 mph becoming calm in the evening.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88. Calm wind becoming north around 6 mph in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70. Northeast wind around 6 mph becoming calm in the evening.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Wednesday Night

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

    Low: 74 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 75. Chance of precipitation is 60%.

    Low: 75 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before midnight. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 70. Light north wind.
Monday
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. North wind 3 to 8 mph.
Monday Night
Partly cloudy, with a low around 68. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 88. Calm wind becoming north around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 70. Northeast wind around 6 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 75. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 71.
Sunday
Mostly sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Madison ILSimilar City Names
 38.68°N 90.14°W (Elev. 407 ft)
Last Update:
8:06 pm CDT Jul 5, 2026
Forecast Valid:
8pm CDT Jul 5, 2026-6pm CDT Jul 12, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation