10-Day Weather Forecast - O'Fallon, IL

Partly sunny in the morning then becoming mostly cloudy. Much cooler with highs in the upper 40s. Northeast winds 10 to 15 mph.

Rain and snow. Little or no snow accumulation. Lows in the mid 30s. East winds around 10 mph with gusts up to 20 mph. Chance of precipitation 90 percent.

Cloudy. Rain likely mainly in the morning. Highs in the mid 40s. East winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 60 percent.

Rain. Near steady temperature in the lower 40s. Temperature rising into the mid 40s after midnight. Southeast winds 5 to 10 mph. Chance of rain 90 percent.

Rain with a chance of thunderstorms. Highs in the mid 60s. Lows in the lower 50s. Chance of rain 90 percent.

Rain with a chance of thunderstorms. Highs in the mid 60s. Lows in the lower 50s. Chance of rain 90 percent.

Rain with a chance of thunderstorms. Highs in the upper 60s. Chance of rain 80 percent.

Rain likely with a slight chance of thunderstorms in the evening then rain likely after midnight. Lows in the lower 50s. Chance of rain 70 percent.

Rain likely. Highs in the lower 70s. Chance of rain 70 percent.

Partly cloudy in the evening then becoming mostly cloudy. A chance of rain and thunderstorms. Lows in the mid 50s. Chance of rain 50 percent.

Rain likely with a slight chance of thunderstorms. Highs in the lower 70s. Chance of rain 70 percent.

Rain likely. A slight chance of thunderstorms in the evening then a chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 70 percent.

Rain likely. Highs in the mid 60s. Chance of rain 70 percent.

Cloudy with a chance of rain. Chance of precipitation 50%. Low temperature around 52F. Dew point will be around 50F with an average humidity of 81%. Winds will be 4 mph from the S.

Cloudy with a chance of rain. Chance of precipitation 50%. High temperature around 66F. Dew point will be around 50F with an average humidity of 67%. Winds will be 4 mph from the S.

Partly cloudy with a chance of rain. Chance of precipitation 45%. Low temperature around 53F. Dew point will be around 50F with an average humidity of 81%. Winds will be 6 mph from the S.

Partly cloudy with a chance of rain. Chance of precipitation 50%. High temperature around 70F. Dew point will be around 54F with an average humidity of 69%. Winds will be 9 mph from the S.

Cloudy with probable rain. Chance of precipitation 65%. Low temperature around 54F. Dew point will be around 53F with an average humidity of 82%. Winds will be 7 mph from the S.