10-Day Weather Forecast - Alton, IL

Partly sunny in the morning then clearing. Highs around 40. North winds 5 to 10 mph.

Mostly clear. Lows in the mid 20s. North winds around 5 mph.

Mostly sunny in the morning then becoming mostly cloudy. Highs around 40. Northeast winds around 5 mph becoming southeast in the afternoon.

Partly cloudy in the evening then clearing. Lows in the lower 30s. South winds 5 to 10 mph.

Sunny. Not as cool with highs in the upper 50s.

Partly cloudy. Lows in the lower 40s. Highs in the lower 60s.

Partly cloudy. Lows in the lower 40s. Highs in the lower 60s.

Mostly cloudy. Lows in the upper 30s. Highs around 60.

Mostly cloudy. Lows in the upper 30s. Highs around 60.

Mostly cloudy. A chance of rain after midnight. Lows in the upper 40s. Chance of rain 30 percent.

Mostly cloudy in the morning then becoming partly sunny. A 50 percent chance of rain. Highs in the lower 60s.

Partly cloudy with a 50 percent chance of rain. Lows in the upper 40s.

Partly sunny with a 20 percent chance of rain. Highs in the upper 50s.

Mostly clear with a slight chance of rain. Chance of precipitation 25%. Low temperature around 43F. Dew point will be around 45F with an average humidity of 82%. Winds will be 7 mph from the W.

Partly cloudy. High temperature around 44F. Dew point will be around 35F with an average humidity of 74%. Winds will be 8 mph from the NW.

Mostly cloudy. Low temperature around 34F. Dew point will be around 31F with an average humidity of 76%. Winds will be 6 mph from the NW.

Sunny. High temperature around 39F. Dew point will be around 29F with an average humidity of 72%. Winds will be 6 mph from the NW.

Clear. Low temperature around 33F. Dew point will be around 28F with an average humidity of 77%. Winds will be 2 mph from the NW.