10-Day Weather Forecast - O'Fallon, IL

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.

Mostly clear. Low temperature around 40F. Dew point will be around 41F with an average humidity of 86%. Winds will be 4 mph from the S.

Mostly cloudy with a chance of rain. Chance of precipitation 35%. High temperature around 53F. Dew point will be around 41F with an average humidity of 76%. 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 88%. Winds will be 9 mph from the S.

Cloudy with a chance of rain. Chance of precipitation 45%. High temperature around 57F. Dew point will be around 46F with an average humidity of 78%. Winds will be 8 mph from the S.

Partly cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 41F. Dew point will be around 42F with an average humidity of 89%. Winds will be 3 mph from the SW.

Mostly cloudy. High temperature around 51F. Dew point will be around 40F with an average humidity of 77%. Winds will be 1 mph from the SW.

Cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 34F. Dew point will be around 35F with an average humidity of 88%. Winds will be 3 mph from the NW.