Weather Forecast for Alton

Alton, IL Weather :: 55F Mostly Cloudy

55F Mostly Cloudy

Tonight

Scattered showers and thunderstorms before midnight, then isolated showers between midnight and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 48. Northwest wind 7 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

Friday

Sunny, with a high near 66. Breezy, with a northwest wind 15 to 20 mph, with gusts as high as 30 mph.

Friday Night

Increasing clouds, with a low around 46. Northwest wind 5 to 9 mph becoming calm in the evening.

Saturday

A 40 percent chance of showers. Mostly cloudy, with a high near 67. South wind 8 to 16 mph, with gusts as high as 28 mph.

Saturday Night

Partly cloudy, with a low around 42. Southwest wind 13 to 16 mph becoming northwest after midnight. Winds could gust as high as 30 mph.

Sunday

Mostly sunny, with a high near 62.

Sunday Night

A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 50.

Monday

Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 70%.

Monday Night

A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 54.

Tuesday

A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 67.

Tuesday Night

A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 56.

Wednesday

A 30 percent chance of showers. Mostly cloudy, with a high near 75.

Wednesday Night

A 30 percent chance of showers. Mostly cloudy, with a low around 61.

Thursday

A 50 percent chance of showers. Mostly cloudy, with a high near 75.