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

69°F

21°C

Humidity 63%
Wind Speed NW 12 mph
Barometer 29.80 in (1008.8 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 26 Dec 1:53 pm CST
Extended Forecast for

3 Miles E Mascoutah IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 71. Northwest wind 7 to 11 mph.

    High: 71 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 44. Northwest wind around 5 mph becoming calm in the evening.

    Low: 44 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, partly sunny, with a high near 64. Light east wind becoming southeast 6 to 11 mph in the morning.

    High: 64 °F

    Patchy Fog
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after midnight. Cloudy, with a low around 59. South wind around 10 mph.

    Low: 59 °F

    Cloudy then
    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain before 9am, then a chance of rain and thunderstorms between 9am and noon, then rain and possibly a thunderstorm after noon. High near 72. South wind 10 to 18 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    High: 72 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: Rain likely, possibly mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 21 °F

    Blustery.
    Rain/Snow
    Likely then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 27. Blustery.

    High: 27 °F

    Mostly Sunny
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 71. Northwest wind 7 to 11 mph.
Tonight
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 44. Northwest wind around 5 mph becoming calm in the evening.
Saturday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 64. Light east wind becoming southeast 6 to 11 mph in the morning.
Saturday Night
A 20 percent chance of rain after midnight. Cloudy, with a low around 59. South wind around 10 mph.
Sunday
A chance of rain before 9am, then a chance of rain and thunderstorms between 9am and noon, then rain and possibly a thunderstorm after noon. High near 72. South wind 10 to 18 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Sunday Night
Rain likely, possibly mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 70%. Little or no snow accumulation expected.
Monday
Mostly sunny, with a high near 27. Blustery.
Monday Night
Mostly clear, with a low around 19.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 26.
Wednesday
Partly sunny, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 20.
New Year's Day
Mostly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Mascoutah IL
 38.52°N 89.75°W (Elev. 466 ft)
Last Update:
1:16 pm CST Dec 26, 2025
Forecast Valid:
2pm CST Dec 26, 2025-6pm CST Jan 1, 2026
 
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Additional Resources

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Chance of Precipitation