Weather in O'Fallon, Missouri, United States

7-Day Detailed Weather Forecast for O'Fallon

Overnight

Temperature: 42°F

Wind Speed: 6 mph

Wind Direction: S

Forecast: Partly cloudy, with a low around 42. South wind around 6 mph.

Tuesday

Temperature: 63°F

Wind Speed: 6 to 15 mph

Wind Direction: S

Forecast: Mostly cloudy, with a high near 63. South wind 6 to 15 mph, with gusts as high as 28 mph.

Tuesday Night

Temperature: 53°F

Wind Speed: 14 to 18 mph

Wind Direction: SW

Forecast: A slight chance of rain between midnight and 3am. Mostly cloudy, with a low around 53. Southwest wind 14 to 18 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.

Wednesday

Temperature: 73°F

Wind Speed: 5 to 14 mph

Wind Direction: SW

Forecast: Sunny. High near 73, with temperatures falling to around 68 in the afternoon. Southwest wind 5 to 14 mph, with gusts as high as 24 mph.

Wednesday Night

Temperature: 48°F

Wind Speed: 6 mph

Wind Direction: S

Forecast: Partly cloudy, with a low around 48. South wind around 6 mph.

Thursday

Temperature: 72°F

Wind Speed: 6 to 14 mph

Wind Direction: S

Forecast: A chance of rain showers before noon, then a chance of showers and thunderstorms. Sunny. High near 72, with temperatures falling to around 68 in the afternoon. Chance of precipitation is 40%.

Thursday Night

Temperature: 36°F

Wind Speed: 10 to 15 mph

Wind Direction: W

Forecast: Clear, with a low around 36.

Friday

Temperature: 49°F

Wind Speed: 7 to 15 mph

Wind Direction: W

Forecast: Sunny, with a high near 49.

Friday Night

Temperature: 30°F

Wind Speed: 6 mph

Wind Direction: NW

Forecast: Partly cloudy, with a low around 30.

Saturday

Temperature: 45°F

Wind Speed: 6 to 10 mph

Wind Direction: NW

Forecast: A chance of snow. Mostly sunny, with a high near 45. Chance of precipitation is 30%. New snow accumulation of less than half an inch possible.

Saturday Night

Temperature: 26°F

Wind Speed: 10 mph

Wind Direction: NW

Forecast: A slight chance of snow before midnight. Mostly clear, with a low around 26. Chance of precipitation is 20%. New snow accumulation of less than half an inch possible.

Sunday

Temperature: 40°F

Wind Speed: 12 mph

Wind Direction: NW

Forecast: Sunny, with a high near 40.

Sunday Night

Temperature: 19°F

Wind Speed: 8 mph

Wind Direction: NW

Forecast: Mostly clear, with a low around 19.

Monday

Temperature: 40°F

Wind Speed: 6 mph

Wind Direction: NW

Forecast: Sunny, with a high near 40.