


Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
72°F
22°C
Humidity | 64% |
Wind Speed | SE 5 mph |
Barometer | 30.00 in (1015.8 mb) |
Dewpoint | 59°F (15°C) |
Visibility | 10.00 mi |
Last update | 16 Oct 7:53 pm CDT |
Extended Forecast for
O'Fallon IL
Tonight
Low: 59 °F
Increasing
CloudsFriday
High: 83 °F
Partly Sunny
Friday Night
Low: 62 °F
Decreasing
CloudsSaturday
High: 82 °F
Showers
Likely then
ShowersSaturday Night
Low: 51 °F
Showers
Sunday
High: 65 °F
Sunny
Sunday Night
Low: 45 °F
Clear
Monday
High: 73 °F
Sunny
Monday Night
Low: 52 °F
Chance
Showers
Detailed Forecast
Tonight
Increasing clouds, with a low around 59. Southeast wind around 8 mph, with gusts as high as 20 mph.
Friday
Partly sunny, with a high near 83. South wind 6 to 11 mph.
Friday Night
Mostly cloudy, then gradually becoming clear, with a low around 62. South wind 8 to 10 mph.
Saturday
Showers likely, then showers and possibly a thunderstorm after 10am. High near 82. Southwest wind 9 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 90%.
Saturday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Low around 51. Southwest wind 10 to 14 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 80%.
Sunday
Sunny, with a high near 65.
Sunday Night
Clear, with a low around 45.
Monday
Sunny, with a high near 73.
Monday Night
A 40 percent chance of showers. Partly cloudy, with a low around 52.
Tuesday
A 20 percent chance of showers before 1pm. Sunny, with a high near 65.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Sunny, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 67.
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)
7:26 pm CDT Oct 16, 2025
8pm CDT Oct 16, 2025-6pm CDT Oct 23, 2025