10-Day Weather Forecast - O'Fallon, MO

Cloudy. Highs in the upper 30s. Northeast winds around 5 mph.

Cloudy. Lows in the upper 20s. Northeast winds around 5 mph.

Mostly sunny. Highs in the lower 40s. North winds around 5 mph.

Mostly clear. Lows in the mid 20s.

Partly cloudy. Highs in the lower 40s. Lows in the mid 30s.

Partly cloudy. Highs in the lower 40s. Lows in the mid 30s.

Sunny. Not as cool with highs in the upper 50s.

Partly cloudy in the evening then becoming mostly cloudy. Lows around 40.

Mostly sunny. Highs in the lower 60s.

Mostly cloudy. Lows in the lower 40s. Highs in the upper 50s.

Mostly cloudy. Lows in the lower 40s. Highs in the upper 50s.

Partly cloudy. Low temperature around 40F. Dew point will be around 39F with an average humidity of 80%. Winds will be 3 mph from the SE.

Mostly cloudy with a chance of rain. Chance of precipitation 40%. High temperature around 51F. Dew point will be around 41F with an average humidity of 79%. Winds will be 7 mph from the SE.

Cloudy with a chance of rain. Chance of precipitation 50%. Low temperature around 46F. Dew point will be around 44F with an average humidity of 84%. Winds will be 9 mph from the S.

Partly cloudy with a chance of rain. Chance of precipitation 35%. High temperature around 54F. Dew point will be around 46F with an average humidity of 82%. Winds will be 7 mph from the S.

Partly cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 40F. Dew point will be around 41F with an average humidity of 87%. Winds will be 3 mph from the SW.

Partly cloudy. High temperature around 47F. Dew point will be around 38F with an average humidity of 79%. Winds will be 1 mph from the SW.

Cloudy with a slight chance of rain. Chance of precipitation 25%. Low temperature around 33F. Dew point will be around 33F with an average humidity of 84%. Winds will be 3 mph from the NW.