10-Day Weather Forecast - O'Fallon, IL

Sunny. Highs in the mid 80s. West winds 10 to 15 mph.

Partly cloudy in the evening then clearing. Lows around 50. North winds 5 to 10 mph becoming northeast after midnight.

Sunny. Highs around 80. East winds around 5 mph becoming south in the afternoon.

Clear. Not as cool with lows in the lower 60s. South winds 5 to 10 mph.

Mostly sunny. Highs in the upper 80s. South winds 10 to 15 mph becoming west in the afternoon.

Partly cloudy. A slight chance of showers in the evening. Much cooler with lows in the lower 40s. Chance of rain 20 percent.

Partly cloudy. Highs in the upper 50s. Lows around 40.

Partly cloudy. Highs in the upper 50s. Lows around 40.

Mostly cloudy. Highs in the lower 60s. Lows in the lower 40s.

Mostly cloudy. Highs in the lower 60s. Lows in the lower 40s.

Partly sunny. Highs in the mid 60s.

Partly cloudy. Lows in the lower 50s.

Sunny. A slight chance of showers in the afternoon. Not as cool with highs in the upper 70s. Chance of rain 20 percent.

Clear with a chance of rain. Chance of precipitation 35%. Low temperature around 47F. Dew point will be around 43F with an average humidity of 57%. Winds will be 5 mph from the N.

Sunny. High temperature around 54F. Dew point will be around 31F with an average humidity of 46%. Winds will be 8 mph from the N.

Clear. Low temperature around 37F. Dew point will be around 27F with an average humidity of 51%. Winds will be 5 mph from the NE.

Sunny. High temperature around 54F. Dew point will be around 29F with an average humidity of 48%. Winds will be 6 mph from the SE.

Partly cloudy. Low temperature around 43F. Dew point will be around 33F with an average humidity of 57%. Winds will be 4 mph from the SE.