10-Day Weather Forecast - Alton, MO

Sunny, hot with highs in the upper 90s. Light and variable winds, becoming south around 5 mph in the afternoon. Heat index values up to 109.

Mostly clear. Humid with lows in the mid 70s. Southeast winds around 5 mph in the evening, becoming light and variable.

Sunny, hot with highs around 100. Light and variable winds. Heat index values up to 109.

Mostly clear. Humid with lows in the lower 70s. Light and variable winds.

Mostly clear. Hot. Highs in the upper 90s.

Mostly clear. Hot. Lows around 70.

Mostly clear. Hot. Highs in the upper 90s.

Mostly clear. Hot. Lows around 70.

Mostly clear. Hot. Highs in the upper 90s.

Mostly clear. Hot. Lows around 70.

Mostly clear. Hot. Highs in the upper 90s.

Mostly clear. Hot. Lows around 70.

Sunny. A slight chance of showers in the morning. Hot with highs in the upper 90s. Chance of rain 20 percent.

Mostly clear with a 40% chance for rain and thunderstorms. Low temperature around 72F. Dew point will be around 69F with an average humidity of 72%. 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 63%. Winds will be 4 mph from the SW.

Clear with widely scattered thunderstorms. Chance of storms 25%. Low temperature around 70F. Dew point will be around 68F with an average humidity of 73%. Winds will be 4 mph from the S.

Sunny. High temperature around 90F. Dew point will be around 68F with an average humidity of 64%. Winds will be 4 mph from the S.

Clear. Low temperature around 69F. Dew point will be around 65F with an average humidity of 70%. Winds will be 4 mph from the S.