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Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Mostly Cloudy
28°F
-2°C
| Humidity | 56% |
| Wind Speed | NW 17 G 35 mph |
| Barometer | 30.36 in (1028.6 mb) |
| Dewpoint | 14°F (-10°C) |
| Visibility | 10.00 mi |
| Wind Chill | 16°F (-9°C) |
| Last update | 11 Jan 4:53 am CST |
Extended Forecast for
O'Fallon IL
Today
High: 38 °F
Becoming
SunnyTonight
Low: 25 °F
Mostly Clear
Monday
High: 51 °F
Sunny
Monday Night
Low: 36 °F
Partly Cloudy
Tuesday
High: 59 °F
Partly Sunny
Tuesday Night
Low: 38 °F
Mostly Cloudy
then Slight
Chance RainWednesday
High: 43 °F
Partly Sunny
Wednesday Night
Low: 19 °F
Partly Cloudy
Thursday
High: 37 °F
Mostly Sunny
Detailed Forecast
Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 38. Northwest wind 7 to 17 mph, with gusts as high as 29 mph.
Tonight
Mostly clear, with a low around 25. Southwest wind 3 to 7 mph.
Monday
Sunny, with a high near 51. Southwest wind 5 to 9 mph.
Monday Night
Partly cloudy, with a low around 36. Southwest wind 3 to 8 mph.
Tuesday
Partly sunny, with a high near 59. Southwest wind 8 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 43.
Wednesday Night
Partly cloudy, with a low around 19.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Mostly cloudy, with a low around 28.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 32.
Additional Forecasts and Information
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Forecast AreaABOUT 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)
4:31 am CST Jan 11, 2026
5am CST Jan 11, 2026-6pm CST Jan 17, 2026
Additional Resources
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