National Weather Service

News Headlines

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

15°F

-9°C

Humidity	77%
Wind Speed	SE 5 mph
Barometer	30.08 in (1019.1 mb)
Dewpoint	9°F (-13°C)
Visibility	10.00 mi
Wind Chill	7°F (-14°C)
Last update	5 Dec 7:53 am CST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

O'Fallon IL

Today
High: 40 °F
Sunny
Tonight
Low: 27 °F
Mostly Cloudy
Saturday
High: 39 °F
Partly Sunny
Saturday Night
Low: 30 °F
Mostly Cloudy
then Chance
Rain
Sunday
High: 39 °F
Slight Chance
Rain/Snow
then Cloudy
Sunday Night
Low: 15 °F
Mostly Cloudy
Monday
High: 31 °F
Mostly Sunny
Monday Night
Low: 23 °F
Partly Cloudy
Tuesday
High: 47 °F
Mostly Sunny

Detailed Forecast

Today

Sunny, with a high near 40. South wind 3 to 8 mph.

Tonight

Mostly cloudy, with a low around 27. South wind around 7 mph becoming west after midnight.

Saturday

Partly sunny, with a high near 39. West wind around 5 mph becoming light and variable.

Saturday Night

A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 30. East wind around 6 mph.

Sunday

A slight chance of rain before 9am, then a slight chance of snow between 9am and noon. Mostly cloudy, with a high near 39. Southeast wind 6 to 13 mph becoming northwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 20%.

Sunday Night

Mostly cloudy, with a low around 15.

Monday

Mostly sunny, with a high near 31.

Monday Night

Partly cloudy, with a low around 23.

Tuesday

Mostly sunny, with a high near 47.

Tuesday Night

Mostly cloudy, with a low around 36.

Wednesday

A 30 percent chance of rain. Mostly cloudy, with a high near 48.