Weather in O'Fallon, Illinois, United States

7-Day Detailed Weather Forecast for O'Fallon

Tonight

Temperature: 49°F

Wind Speed: 5 mph

Wind Direction: S

Forecast: Mostly cloudy, with a low around 49. South wind around 5 mph.

Thursday

Temperature: 68°F

Wind Speed: 6 to 17 mph

Wind Direction: S

Forecast: Scattered showers and thunderstorms between 9am and 11am, then a chance of showers and thunderstorms between 11am and noon, then scattered showers and thunderstorms between noon and 5pm. Partly sunny, with a high near 68. South wind 6 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%.

Thursday Night

Temperature: 35°F

Wind Speed: 12 to 18 mph

Wind Direction: W

Forecast: Mostly clear, with a low around 35. West wind 12 to 18 mph, with gusts as high as 28 mph.

Friday

Temperature: 49°F

Wind Speed: 6 to 17 mph

Wind Direction: W

Forecast: Sunny, with a high near 49. West wind 6 to 17 mph, with gusts as high as 26 mph.

Friday Night

Temperature: 31°F

Wind Speed: 6 mph

Wind Direction: NW

Forecast: Partly cloudy, with a low around 31. Northwest wind around 6 mph.

Saturday

Temperature: 44°F

Wind Speed: 6 to 12 mph

Wind Direction: NW

Forecast: A slight chance of rain and snow after noon. Mostly sunny, with a high near 44. Chance of precipitation is 20%.

Saturday Night

Temperature: 25°F

Wind Speed: 8 to 14 mph

Wind Direction: NW

Forecast: Mostly clear, with a low around 25.

Sunday

Temperature: 39°F

Wind Speed: 14 to 17 mph

Wind Direction: NW

Forecast: Sunny, with a high near 39.

Sunday Night

Temperature: 21°F

Wind Speed: 12 mph

Wind Direction: NW

Forecast: Mostly clear, with a low around 21.

Monday

Temperature: 38°F

Wind Speed: 5 to 10 mph

Wind Direction: NW

Forecast: Sunny, with a high near 38.

Monday Night

Temperature: 22°F

Wind Speed: 3 mph

Wind Direction: SW

Forecast: Mostly clear, with a low around 22.

Tuesday

Temperature: 49°F

Wind Speed: 5 to 15 mph

Wind Direction: S

Forecast: Mostly sunny, with a high near 49.

Tuesday Night

Temperature: 37°F

Wind Speed: 14 mph

Wind Direction: S

Forecast: Mostly cloudy, with a low around 37.

Wednesday

Temperature: 57°F

Wind Speed: 14 mph

Wind Direction: SW

Forecast: A slight chance of rain. Partly sunny, with a high near 57. Chance of precipitation is 20%.