10-Day Weather Forecast - Alton, IL

Sunny. Not as cool with highs in the upper 50s. South winds 5 to 10 mph.

Partly cloudy in the evening then becoming mostly cloudy. Not as cool with lows in the mid 40s. South winds 5 to 10 mph with gusts up to 20 mph.

Partly sunny in the morning then clearing. Highs in the lower 60s. West winds 10 to 15 mph.

Mostly clear. Lows in the mid 30s. West winds around 5 mph.

Mostly sunny. Highs in the lower 60s.

Partly cloudy in the evening then mostly cloudy with a slight chance of rain after midnight. Not as cool with lows in the mid 40s. Chance of rain 20 percent.

Mostly cloudy. A chance of rain in the morning then rain likely in the afternoon. Highs in the upper 50s. Chance of rain 70 percent.

Mostly cloudy. Rain likely mainly in the evening. Lows in the mid 40s. Chance of rain 60 percent.

Partly sunny with a 30 percent chance of rain. Highs in the mid 50s.

Partly cloudy. A slight chance of rain in the evening. Cooler with lows in the lower 30s. Chance of rain 20 percent.

Partly cloudy. Highs in the mid 40s. Lows in the mid 20s.

Partly cloudy. Highs in the mid 40s. Lows in the mid 20s.

Partly cloudy. Highs in the mid 40s. Lows in the mid 20s.

Clear. Low temperature around 28F. Dew point will be around 22F with an average humidity of 71%. Winds will be 3 mph from the W.

Sunny. High temperature around 42F. Dew point will be around 28F with an average humidity of 66%. Winds will be 7 mph from the SW.

Clear. Low temperature around 34F. Dew point will be around 31F with an average humidity of 76%. Winds will be 5 mph from the W.

Mostly sunny. High temperature around 42F. Dew point will be around 32F with an average humidity of 74%. Winds will be 6 mph from the W.

Mostly clear. Low temperature around 32F. Dew point will be around 30F with an average humidity of 79%. Winds will be 5 mph from the NW.