10-Day Weather Forecast - O'Fallon, MO

Sunny. Highs in the mid 80s. West winds 5 to 10 mph.

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

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

Clear. Lows in the upper 50s. South winds 5 to 10 mph.

Partly cloudy. Highs in the mid 80s. Lows in the lower 40s.

Partly cloudy. Highs in the mid 80s. Lows in the lower 40s.

Partly cloudy. Highs in the upper 50s. Lows in the upper 30s.

Partly cloudy. Highs in the upper 50s. Lows in the upper 30s.

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 cloudy. Highs around 70. Lows in the mid 50s.

Partly cloudy. Highs around 70. Lows in the mid 50s.

Mostly sunny with a 20 percent chance of rain. Highs in the upper 70s.

Mostly clear with a chance of rain. Chance of precipitation 35%. Low temperature around 46F. Dew point will be around 40F with an average humidity of 50%. Winds will be 6 mph from the N.

Mostly sunny. High temperature around 55F. Dew point will be around 29F with an average humidity of 43%. Winds will be 8 mph from the N.

Clear. Low temperature around 37F. Dew point will be around 26F with an average humidity of 46%. Winds will be 4 mph from the NE.

Sunny. High temperature around 55F. Dew point will be around 28F with an average humidity of 46%. Winds will be 5 mph from the SE.

Partly cloudy. Low temperature around 42F. Dew point will be around 31F with an average humidity of 52%. Winds will be 3 mph from the SE.