Weather in O'Fallon, Missouri, United States

7-Day Detailed Weather Forecast for O'Fallon

This Afternoon

Temperature: 92°F

Wind Speed: 12 to 17 mph

Wind Direction: SW

Forecast: Sunny, with a high near 92. Southwest wind 12 to 17 mph, with gusts as high as 31 mph.

Tonight

Temperature: 40°F

Wind Speed: 9 to 18 mph

Wind Direction: N

Forecast: Showers and thunderstorms likely between 9pm and 1am, then showers and thunderstorms. Mostly cloudy. Low around 40, with temperatures rising to around 47 overnight. North wind 9 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 90%.

Friday

Temperature: 54°F

Wind Speed: 14 to 17 mph

Wind Direction: N

Forecast: A chance of rain showers before 9am. Partly sunny, with a high near 54. North wind 14 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

Friday Night

Temperature: 31°F

Wind Speed: 3 to 13 mph

Wind Direction: N

Forecast: Mostly clear, with a low around 31. North wind 3 to 13 mph, with gusts as high as 22 mph.

Saturday

Temperature: 57°F

Wind Speed: 2 to 7 mph

Wind Direction: E

Forecast: Sunny, with a high near 57. East wind 2 to 7 mph.

Saturday Night

Temperature: 43°F

Wind Speed: 8 mph

Wind Direction: S

Forecast: Partly cloudy, with a low around 43.

Sunday

Temperature: 70°F

Wind Speed: 9 mph

Wind Direction: S

Forecast: Partly sunny, with a high near 70.

Sunday Night

Temperature: 58°F

Wind Speed: 10 mph

Wind Direction: S

Forecast: Partly cloudy, with a low around 58.

Monday

Temperature: 86°F

Wind Speed: 9 to 13 mph

Wind Direction: SW

Forecast: Mostly sunny, with a high near 86.

Monday Night

Temperature: 64°F

Wind Speed: 13 mph

Wind Direction: S

Forecast: A slight chance of rain after 7pm. Partly cloudy, with a low around 64. Chance of precipitation is 20%.

Tuesday

Temperature: 88°F

Wind Speed: 12 to 16 mph

Wind Direction: SW

Forecast: A slight chance of rain before 7am, then a slight chance of thunderstorms and a slight chance of rain. Partly sunny, with a high near 88. Chance of precipitation is 20%.

Tuesday Night

Temperature: 59°F

Wind Speed: 14 mph

Wind Direction: S

Forecast: A chance of thunderstorms and a chance of rain. Mostly cloudy, with a low around 59. Chance of precipitation is 40%.

Wednesday

Temperature: 79°F

Wind Speed: 15 mph

Wind Direction: SW

Forecast: A chance of thunderstorms and a chance of rain. Partly sunny, with a high near 79. Chance of precipitation is 40%.

Wednesday Night

Temperature: 56°F

Wind Speed: 14 mph

Wind Direction: S

Forecast: A chance of thunderstorms and a chance of rain before 1am, then rain likely and a slight chance of thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.