Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
43°F
6°C
| Humidity | 58% |
| Wind Speed | NE 13 G 20 mph |
| Barometer | 30.44 in (1030.9 mb) |
| Dewpoint | 29°F (-2°C) |
| Visibility | 10.00 mi |
| Wind Chill | 36°F (2°C) |
| Last update | 23 Mar 10:53 am CDT |
Extended Forecast for
O'Fallon IL
Today
High: 54 °F
Mostly Sunny
Tonight
Low: 37 °F
Chance
SprinklesTuesday
High: 61 °F
Mostly Sunny
Tuesday Night
Low: 42 °F
Mostly Cloudy
Wednesday
High: 75 °F
Mostly Sunny
Wednesday Night
Low: 59 °F
Mostly Clear
Thursday
High: 88 °F
Sunny
Thursday Night
Low: 43 °F
Chance
T-storms then
Showers
LikelyFriday
High: 51 °F
Chance
Showers
Detailed Forecast
Today
Mostly sunny, with a high near 54. North wind around 10 mph.
Tonight
A chance of sprinkles after 3am. Mostly cloudy, with a low around 37. East wind around 7 mph.
Tuesday
Mostly sunny, with a high near 61. Southeast wind around 7 mph.
Tuesday Night
Mostly cloudy, with a low around 42. Southeast wind around 6 mph.
Wednesday
Mostly sunny, with a high near 75. South wind 5 to 11 mph.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Sunny, with a high near 88.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.
Friday
A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 51.
Friday Night
Partly cloudy, with a low around 32.
Saturday
Sunny, with a high near 57.
Saturday Night
Mostly clear, with a low around 36.
Sunday
Mostly sunny, with a high near 63.
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)
10:21 am CDT Mar 23, 2026
11am CDT Mar 23, 2026-6pm CDT Mar 29, 2026
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