10-Day Weather Forecast - O'Fallon, MO

Partly sunny. Highs in the lower 50s. North winds around 5 mph.

Mostly cloudy. A slight chance of rain in the evening then a chance of rain after midnight. Lows in the mid 30s. Northeast winds around 5 mph. Chance of rain 50 percent.

Mostly cloudy with a slight chance of rain in the morning then partly sunny in the afternoon. Highs in the lower 50s. East winds 5 to 10 mph becoming northeast in the afternoon. Chance of rain 20 percent.

Mostly clear. Lows in the lower 30s.

Sunny. Not as cool with highs in the mid 60s.

Mostly clear. Lows around 40. Highs in the mid 60s.

Mostly clear. Lows around 40. Highs in the mid 60s.

Partly cloudy. Lows in the lower 30s.

Partly sunny with a slight chance of rain and snow in the morning then mostly cloudy with a chance of rain and snow in the afternoon. Much cooler with highs in the mid 40s. Chance of precipitation 30 percent.

Mostly cloudy with a chance of rain snow with a slight chance of thunderstorms. Lows in the lower 30s. Highs in the upper 40s. Chance of precipitation 40 percent.

Mostly cloudy with a chance of rain snow with a slight chance of thunderstorms. Lows in the lower 30s. Highs in the upper 40s. Chance of precipitation 40 percent.

Mostly cloudy with a chance of rain-snow mix. Chance of precipitation 35%. Low temperature around 24F. Dew point will be around 27F with an average humidity of 76%. Winds will be 6 mph from the E.

Sunny with a chance of rain-snow mix. Chance of precipitation 35%. High temperature around 44F. Dew point will be around 27F with an average humidity of 69%. Winds will be 4 mph from the E.

Mostly clear with a chance of rain-snow mix. Chance of precipitation 40%. Low temperature around 30F. Dew point will be around 28F with an average humidity of 75%. Winds will be 2 mph from the SE.

Mostly sunny. High temperature around 51F. Dew point will be around 36F with an average humidity of 71%. Winds will be 4 mph from the SE.

Partly cloudy. Low temperature around 41F. Dew point will be around 38F with an average humidity of 76%. Winds will be 6 mph from the S.

Mostly cloudy. High temperature around 63F. Dew point will be around 46F with an average humidity of 68%. Winds will be 10 mph from the S.

Partly cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 52F. Dew point will be around 49F with an average humidity of 76%. Winds will be 10 mph from the S.