Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Partly Cloudy
20°F
-7°C
| Humidity | 65% |
| Wind Speed | NE 12 mph |
| Barometer | 30.44 in (1031.3 mb) |
| Dewpoint | 10°F (-12°C) |
| Visibility | 10.00 mi |
| Wind Chill | 8°F (-13°C) |
| Last update | 4 Dec 9:53 am CST |
Extended Forecast for
O'Fallon IL
Today

High: 24 °F
Partly Sunny
Tonight

Low: 12 °F
Decreasing
CloudsFriday

High: 38 °F
Sunny
Friday Night

Low: 26 °F
Mostly Cloudy
Saturday

High: 38 °F
Partly Sunny
Saturday Night
Low: 28 °F
Mostly Cloudy
then Chance
Freezing RainSunday
High: 34 °F
Slight Chance
Rain/Snow
then Mostly
CloudySunday Night

Low: 18 °F
Mostly Cloudy
Monday

High: 32 °F
Mostly Sunny
Detailed Forecast
Today
Partly sunny, with a high near 24. North wind 5 to 8 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 12. North wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 38. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly cloudy, with a low around 26. South wind around 6 mph becoming light and variable after midnight.
Saturday
Partly sunny, with a high near 38. Light and variable wind becoming northeast around 6 mph in the afternoon.
Saturday Night
A chance of freezing rain after midnight. Cloudy, with a low around 28. Chance of precipitation is 30%.
Sunday
A slight chance of rain and snow before noon. Mostly cloudy, with a high near 34. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 18.
Monday
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 23.
Tuesday
Partly sunny, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 47.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
O'Fallon IL
38.59°N 89.92°W (Elev. 551 ft)
38.59°N 89.92°W (Elev. 551 ft)
7:31 am CST Dec 4, 2025
10am CST Dec 4, 2025-6pm CST Dec 10, 2025


