Weather Forecast for Alton

Alton, IL Weather :: 88F Mostly Cloudy

88F Mostly Cloudy

This Afternoon

Mostly sunny, with a high near 91. Heat index values as high as 101. Calm wind.

Tonight

Mostly clear, with a low around 73. Southeast wind around 5 mph becoming calm in the evening.

Tuesday

Showers and thunderstorms likely, mainly before 3pm. Increasing clouds, with a high near 88. Calm wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 60%.

Tuesday Night

Partly cloudy, with a low around 75. South wind 3 to 8 mph.

Wednesday

A 50 percent chance of showers and thunderstorms after 8am. Partly sunny, with a high near 90. Light west wind.

Wednesday Night

Showers and thunderstorms likely, mainly after 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.

Thursday

Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.

Thursday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.

Friday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.

Friday Night

A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 63.

Saturday

A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.

Saturday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.

Sunday

A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.

Sunday Night

Partly cloudy, with a low around 68.

Monday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.