Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
70°F
21°C
| Humidity | 97% |
| Wind Speed | Calm |
| Barometer | 29.98 in (1014.8 mb) |
| Dewpoint | 69°F (21°C) |
| Visibility | 9.00 mi |
| Last update | 14 Aug 5:53 am CDT |
Extended Forecast for
O'Fallon IL
Today
High: 88 °F
Patchy Fog
then Mostly
SunnyTonight
Low: 71 °F
Mostly Clear
Friday
High: 93 °F
Sunny
Friday Night
Low: 73 °F
Mostly Clear
Saturday
High: 96 °F
Sunny
Saturday Night
Low: 74 °F
Mostly Clear
Sunday
High: 96 °F
Sunny
Sunday Night
Low: 74 °F
Mostly Clear
Monday
High: 96 °F
Sunny
Detailed Forecast
Today
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 71. Light east wind.
Friday
Sunny, with a high near 93. South wind 3 to 7 mph.
Friday Night
Mostly clear, with a low around 73. Southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 96. Calm wind becoming southeast around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 74.
Sunday
Sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 96.
Monday Night
Partly cloudy, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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)
5:46 am CDT Aug 14, 2025
7am CDT Aug 14, 2025-6pm CDT Aug 20, 2025
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