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.

Fog/Mist

60°F

16°C

Humidity 100%
Wind Speed S 3 mph
Barometer 29.74 in (1007.0 mb)
Dewpoint 60°F (16°C)
Visibility 6.00 mi
Last update 28 Dec 2:53 am CST
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: Cloudy, with a steady temperature around 64. South wind around 6 mph.

    Low: 64 °F

    Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 73. Breezy, with a south wind 7 to 12 mph becoming west 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 70%.

    High: 73 °F

    Slight Chance
    Showers then
    Showers
    Likely and
    Breezy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 20. Breezy, with a west wind 20 to 22 mph, with gusts as high as 36 mph.

    Low: 20 °F

    Breezy.
    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 30. Breezy, with a northwest wind 15 to 22 mph, with gusts as high as 33 mph.

    High: 30 °F

    Mostly Sunny
    and Breezy
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 17. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.

    Low: 17 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

Detailed Forecast

Overnight
Cloudy, with a steady temperature around 64. South wind around 6 mph.
Sunday
A chance of showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 73. Breezy, with a south wind 7 to 12 mph becoming west 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 70%.
Sunday Night
A 30 percent chance of showers before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 20. Breezy, with a west wind 20 to 22 mph, with gusts as high as 36 mph.
Monday
Mostly sunny, with a high near 30. Breezy, with a northwest wind 15 to 22 mph, with gusts as high as 33 mph.
Monday Night
Mostly clear, with a low around 17. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Mostly clear, with a low around 27.
Wednesday
Mostly sunny, with a high near 46.
Wednesday Night
Partly cloudy, with a low around 27.
New Year's Day
Mostly sunny, with a high near 41.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 30.
Saturday
Mostly cloudy, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
1:56 am CST Dec 28, 2025
Forecast Valid:
3am CST Dec 28, 2025-6pm CST Jan 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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