Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
41°F
5°C
| Humidity | 100% |
| Wind Speed | Calm |
| Barometer | 30.38 in (1028.8 mb) |
| Dewpoint | 41°F (5°C) |
| Visibility | 10.00 mi |
| Last update | 19 Oct 2:53 am CDT |
Extended Forecast for
O'Fallon IL
Overnight
Low: 41 °F
Clear
Monday
High: 72 °F
Sunny
Monday Night
Low: 45 °F
Partly Cloudy
Tuesday
High: 74 °F
Sunny
Tuesday Night
Low: 44 °F
Mostly Clear
Wednesday
High: 77 °F
Sunny
Wednesday Night
Low: 47 °F
Clear
Thursday
High: 78 °F
Sunny
Thursday Night
Low: 49 °F
Clear
Detailed Forecast
Overnight
Clear, with a low around 41. Calm wind.
Monday
Sunny, with a high near 72. Calm wind.
Monday Night
Partly cloudy, with a low around 45. Calm wind.
Tuesday
Sunny, with a high near 74. Calm wind.
Tuesday Night
Mostly clear, with a low around 44. Calm wind.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Clear, with a low around 47.
Thursday
Sunny, with a high near 78.
Thursday Night
Clear, with a low around 49.
Friday
Sunny, with a high near 78.
Friday Night
Mostly clear, with a low around 49.
Saturday
Mostly sunny, with a high near 80.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
Mostly sunny, with a high near 80.
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)
2:41 am CDT Oct 19, 2026
3am CDT Oct 19, 2026-6pm CDT Oct 25, 2026
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