National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Hazardous Weather This Weekend

A series of cold fronts from North Pacific storms will bring periods of gusty winds, low elevation rainfall, and high elevation snow to the Pacific Northwest this weekend into next week. Heavy to excessive rainfall may produce areas of flooding over southern Texas this weekend. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

52°F

11°C

Humidity 50%
Wind Speed N 6 mph
Barometer 30.21 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 7 Nov 1:53 pm CST
Extended Forecast for

O'Fallon IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 54. Light west wind.

    High: 54 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 63. West wind 3 to 8 mph.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40. West wind around 5 mph becoming calm in the evening.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 66. Calm wind becoming southwest around 5 mph.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 45.

    Low: 45 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Veterans Day

    Veterans Day: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 66.

    High: 66 °F

    Chance Rain

Detailed Forecast

This Afternoon
Partly sunny, with a high near 54. Light west wind.
Tonight
Mostly clear, with a low around 34. Calm wind.
Sunday
Sunny, with a high near 63. West wind 3 to 8 mph.
Sunday Night
Mostly clear, with a low around 40. West wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 66. Calm wind becoming southwest around 5 mph.
Monday Night
Clear, with a low around 45.
Tuesday
Sunny, with a high near 69.
Tuesday Night
Mostly clear, with a low around 45.
Veterans Day
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 66.
Wednesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 44.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 54.
Thursday Night
Partly cloudy, with a low around 34.
Friday
Mostly sunny, with a high near 51.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon IL
 38.59°N 89.89°W (Elev. 541 ft)
Last Update:
1:36 pm CST Nov 7, 2026
Forecast Valid:
2pm CST Nov 7, 2026-6pm CST Nov 13, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation