10-Day Weather Forecast - Saint Charles, MO

Partly sunny. Highs in the mid 80s. North winds around 5 mph.

Partly cloudy in the evening then clearing. Lows in the upper 60s. Northeast winds around 5 mph in the evening becoming light and variable.

Mostly sunny. Highs in the upper 80s. Light and variable winds becoming south around 5 mph in the afternoon.

Mostly clear. Lows in the lower 70s. South winds around 5 mph.

Sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 100.

Partly cloudy in the evening then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening then showers likely after midnight. Lows in the lower 70s. Chance of rain 70 percent. Heat index values up to 100 early in the evening.

Showers likely with a chance of thunderstorms. Highs around 90. Lows in the lower 70s. Chance of rain 70 percent. Heat index values up to 100.

Showers likely with a chance of thunderstorms. Highs around 90. Lows in the lower 70s. Chance of rain 70 percent. Heat index values up to 100.

Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning then a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50 percent.

Mostly cloudy with a chance of showers with a slight chance of thunderstorms in the evening then partly cloudy with a slight chance of showers after midnight. Lows around 70. Chance of rain 50 percent.

Mostly sunny. A slight chance of showers in the morning. Highs around 90. Chance of rain 20 percent.

Mostly clear. Lows in the lower 70s. Highs in the lower 90s. Heat index values up to 100.

Mostly clear. Lows in the lower 70s. Highs in the lower 90s. Heat index values up to 100.

Clear with widespread thunderstorms. Chance of storms 85%. Low temperature around 74F. Dew point will be around 71F with an average humidity of 79%. Winds will be 1 mph from the E.

Sunny with widespread thunderstorms. Chance of storms 85%. High temperature around 88F. Dew point will be around 72F with an average humidity of 69%. Winds will be 2 mph from the NE.

Clear with widespread thunderstorms. Chance of storms 85%. Low temperature around 71F. Dew point will be around 69F with an average humidity of 77%. Winds will be 1 mph from the NE.

Sunny with widespread thunderstorms. Chance of storms 100%. High temperature around 87F. Dew point will be around 69F with an average humidity of 68%. Winds will be 2 mph from the N.

Clear with widespread thunderstorms. Chance of storms 95%. Low temperature around 69F. Dew point will be around 68F with an average humidity of 79%. Winds will be 2 mph from the NE.