Weather in O'Fallon, Illinois, United States

7-Day Detailed Weather Forecast for O'Fallon

This Afternoon

Temperature: 69°F

Wind Speed: 8 mph

Wind Direction: SE

Forecast: A slight chance of thunderstorms and a slight chance of rain before 5pm. Mostly sunny, with a high near 69. Southeast wind around 8 mph. Chance of precipitation is 20%.

Tonight

Temperature: 34°F

Wind Speed: 8 to 20 mph

Wind Direction: W

Forecast: Partly cloudy, with a low around 34. West wind 8 to 20 mph, with gusts as high as 37 mph.

Friday

Temperature: 48°F

Wind Speed: 7 to 21 mph

Wind Direction: W

Forecast: Sunny, with a high near 48. West wind 7 to 21 mph, with gusts as high as 35 mph.

Friday Night

Temperature: 29°F

Wind Speed: 6 mph

Wind Direction: NW

Forecast: Partly cloudy, with a low around 29. Northwest wind around 6 mph.

Saturday

Temperature: 44°F

Wind Speed: 6 to 12 mph

Wind Direction: NW

Forecast: Mostly sunny, with a high near 44. Northwest wind 6 to 12 mph.

Saturday Night

Temperature: 25°F

Wind Speed: 13 mph

Wind Direction: NW

Forecast: Mostly clear, with a low around 25.

Sunday

Temperature: 37°F

Wind Speed: 14 to 20 mph

Wind Direction: NW

Forecast: Sunny, with a high near 37.

Sunday Night

Temperature: 19°F

Wind Speed: 14 mph

Wind Direction: NW

Forecast: Mostly clear, with a low around 19.

Monday

Temperature: 36°F

Wind Speed: 6 to 14 mph

Wind Direction: NW

Forecast: Sunny, with a high near 36.

Monday Night

Temperature: 20°F

Wind Speed: 5 mph

Wind Direction: SW

Forecast: Mostly clear, with a low around 20.

Tuesday

Temperature: 50°F

Wind Speed: 6 to 16 mph

Wind Direction: S

Forecast: Mostly sunny, with a high near 50.

Tuesday Night

Temperature: 39°F

Wind Speed: 12 to 15 mph

Wind Direction: S

Forecast: Mostly cloudy, with a low around 39.

Wednesday

Temperature: 59°F

Wind Speed: 12 mph

Wind Direction: SW

Forecast: A slight chance of rain. Mostly cloudy, with a high near 59. Chance of precipitation is 20%.

Wednesday Night

Temperature: 38°F

Wind Speed: 8 mph

Wind Direction: NW

Forecast: A slight chance of rain. Mostly cloudy, with a low around 38. Chance of precipitation is 20%.