Weather in O'Fallon, Illinois, United States

7-Day Detailed Weather Forecast for O'Fallon

This Afternoon

Temperature: 56°F

Wind Speed: 8 mph

Wind Direction: W

Forecast: Scattered rain showers. Partly sunny. High near 56, with temperatures falling to around 43 in the afternoon. West wind around 8 mph.

Tonight

Temperature: 25°F

Wind Speed: 7 to 23 mph

Wind Direction: W

Forecast: Isolated rain showers before 8pm, then scattered rain and snow showers between 8pm and midnight. Mostly cloudy, with a low around 25. West wind 7 to 23 mph, with gusts as high as 41 mph. Chance of precipitation is 20%.

Friday

Temperature: 39°F

Wind Speed: 7 to 17 mph

Wind Direction: W

Forecast: Sunny. High near 39, with temperatures falling to around 34 in the afternoon. West wind 7 to 17 mph, with gusts as high as 32 mph.

Friday Night

Temperature: 32°F

Wind Speed: 7 to 14 mph

Wind Direction: S

Forecast: Mostly clear, with a low around 32. South wind 7 to 14 mph, with gusts as high as 23 mph.

Saturday

Temperature: 55°F

Wind Speed: 9 to 14 mph

Wind Direction: SW

Forecast: Mostly sunny. High near 55, with temperatures falling to around 50 in the afternoon. Southwest wind 9 to 14 mph, with gusts as high as 23 mph.

Saturday Night

Temperature: 28°F

Wind Speed: 5 to 8 mph

Wind Direction: NW

Forecast: Partly cloudy, with a low around 28.

Sunday

Temperature: 42°F

Wind Speed: 6 mph

Wind Direction: N

Forecast: Mostly sunny, with a high near 42.

Sunday Night

Temperature: 28°F

Wind Speed: 3 to 7 mph

Wind Direction: E

Forecast: Partly cloudy, with a low around 28.

Monday

Temperature: 47°F

Wind Speed: 7 to 10 mph

Wind Direction: SE

Forecast: Partly sunny, with a high near 47.

Monday Night

Temperature: 41°F

Wind Speed: 9 mph

Wind Direction: S

Forecast: Mostly cloudy, with a low around 41.

Tuesday

Temperature: 62°F

Wind Speed: 9 mph

Wind Direction: SW

Forecast: Partly sunny, with a high near 62.

Tuesday Night

Temperature: 50°F

Wind Speed: 6 mph

Wind Direction: S

Forecast: Mostly cloudy, with a low around 50.

Wednesday

Temperature: 67°F

Wind Speed: 6 to 10 mph

Wind Direction: S

Forecast: Mostly cloudy, with a high near 67.

Wednesday Night

Temperature: 55°F

Wind Speed: 9 mph

Wind Direction: S

Forecast: Mostly cloudy, with a low around 55.