10-Day Weather Forecast - Saint Charles, MO

Mostly sunny. Humid with highs in the lower 90s. Northwest winds 5 to 10 mph, becoming north in the afternoon. Heat index values up to 104.

Mostly cloudy in the evening, then clearing. Lows in the upper 60s. Northeast winds 5 to 10 mph. Heat index values up to 100 early in the evening.

Sunny. Highs in the upper 80s. Northeast winds 5 to 10 mph.

Clear. Lows in the upper 60s. Northeast winds around 5 mph in the evening, becoming light and variable.

Sunny. Highs in the upper 80s.

Partly cloudy in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 20 percent.

Partly sunny in the morning, then becoming mostly cloudy. A chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.

Showers likely with a chance of thunderstorms. Lows in the upper 60s. Chance of rain 70 percent.

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

Partly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 20 percent.

Partly cloudy. A slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent.

Mostly clear. Lows in the upper 60s.

Mostly clear. Highs in the mid 80s.

Clear with widely scattered thunderstorms. Chance of storms 30%. Low temperature around 74F. Dew point will be around 69F with an average humidity of 74%. Winds will be 5 mph from the S.

Sunny with widely scattered thunderstorms. Chance of storms 30%. High temperature around 90F. Dew point will be around 70F with an average humidity of 63%. Winds will be 4 mph from the SW.

Clear with widely scattered thunderstorms. Chance of storms 30%. Low temperature around 76F. Dew point will be around 70F with an average humidity of 68%. Winds will be 4 mph from the S.

Sunny with widely scattered thunderstorms. Chance of storms 25%. High temperature around 92F. Dew point will be around 69F with an average humidity of 58%. Winds will be 4 mph from the W.

Clear with a 25% chance for rain and thunderstorms. Low temperature around 76F. Dew point will be around 70F with an average humidity of 68%. Winds will be 2 mph from the S.