10-Day Weather Forecast - O'Fallon, IL

A chance of snow in the morning. Mostly cloudy with a slight chance of freezing drizzle. Highs in the mid 30s. North winds 5 to 10 mph. Chance of precipitation 30 percent.

Mostly cloudy. Cooler with lows around 17. North winds around 5 mph.

Mostly sunny. Highs around 30. North winds around 5 mph.

Mostly clear in the evening then becoming partly cloudy. Lows around 15. West winds around 5 mph.

Partly sunny. Not as cool with highs around 40.

Mostly clear. Not as cool with lows in the lower 30s.

Mostly sunny. Highs in the upper 40s.

Mostly clear. Lows in the lower 20s.

Partly cloudy. Highs in the upper 30s. Lows in the mid 20s.

Partly cloudy. Highs in the upper 30s. Lows in the mid 20s.

Partly cloudy. Highs in the mid 40s. Lows in the mid 20s.

Partly cloudy. Highs in the mid 40s. Lows in the mid 20s.

Partly cloudy. Highs in the mid 40s. Lows in the mid 20s.

Mostly clear. Low temperature around 30F. Dew point will be around 20F with an average humidity of 58%. Winds will be 6 mph from the SE.

Mostly sunny. High temperature around 45F. Dew point will be around 22F with an average humidity of 49%. Winds will be 6 mph from the SE.

Partly cloudy with a slight chance of rain. Chance of precipitation 30%. Low temperature around 36F. Dew point will be around 28F with an average humidity of 64%. Winds will be 7 mph from the SE.

Cloudy with a chance of rain. Chance of precipitation 35%. High temperature around 49F. Dew point will be around 32F with an average humidity of 59%. Winds will be 8 mph from the SE.

Cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 44F. Dew point will be around 38F with an average humidity of 72%. Winds will be 7 mph from the S.