10-Day Weather Forecast - Saint Charles, MO

Mostly cloudy in the morning then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Southeast winds 10 to 15 mph. Chance of rain 30 percent.

Mostly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Southeast winds 5 to 10 mph. Chance of rain 50 percent.

A chance of thunderstorms. Showers. Highs in the mid 80s. South winds 5 to 10 mph. Chance of rain 90 percent.

A chance of thunderstorms. Showers. Lows in the lower 70s. South winds 5 to 10 mph. Chance of rain 90 percent.

Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon.

Mostly clear. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105.

Mostly clear. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105.

Mostly clear. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105.

Mostly sunny. A slight chance of showers and thunderstorms in the morning then a chance of showers and thunderstorms in the afternoon. Highs in the mid 90s. Chance of rain 30 percent. Heat index values up to 105.

Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening then a chance of showers after midnight. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening.

Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 100.

Partly cloudy in the evening then becoming mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 70s. Chance of rain 30 percent.

Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent.

Mostly clear with a 40% chance for rain and thunderstorms. Low temperature around 67F. Dew point will be around 67F with an average humidity of 85%. Winds will be 2 mph from the N.

Mostly sunny with a chance of rain. Chance of precipitation 35%. High temperature around 80F. Dew point will be around 67F with an average humidity of 73%. Winds will be 4 mph from the N.

Mostly clear with a slight chance of rain. Chance of precipitation 30%. Low temperature around 64F. Dew point will be around 64F with an average humidity of 85%. Winds will be 5 mph from the N.

Sunny with a slight chance of rain. Chance of precipitation 30%. High temperature around 79F. Dew point will be around 65F with an average humidity of 72%. Winds will be 4 mph from the N.

Mostly clear with a chance of rain. Chance of precipitation 35%. Low temperature around 63F. Dew point will be around 63F with an average humidity of 83%. Winds will be 4 mph from the NE.