Weather in Alton, Illinois, United States

7-Day Detailed Weather Forecast for Alton

Overnight

Temperature: 46°F

Wind Speed: 3 mph

Wind Direction: SE

Forecast: Widespread fog. Mostly cloudy, with a low around 46. Southeast wind around 3 mph.

Thursday

Temperature: 67°F

Wind Speed: 5 to 13 mph

Wind Direction: S

Forecast: Widespread fog before 8am, then thunderstorms likely and rain likely between 9am and noon, then showers and thunderstorms likely between noon and 4pm. Mostly cloudy, with a high near 67. South wind 5 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

Thursday Night

Temperature: 37°F

Wind Speed: 10 to 20 mph

Wind Direction: W

Forecast: Partly cloudy, with a low around 37. West wind 10 to 20 mph, with gusts as high as 33 mph.

Friday

Temperature: 49°F

Wind Speed: 7 to 18 mph

Wind Direction: W

Forecast: Mostly sunny, with a high near 49. West wind 7 to 18 mph, with gusts as high as 29 mph.

Friday Night

Temperature: 30°F

Wind Speed: 6 mph

Wind Direction: NW

Forecast: Partly cloudy, with a low around 30. Northwest wind around 6 mph.

Saturday

Temperature: 46°F

Wind Speed: 5 to 12 mph

Wind Direction: NW

Forecast: A slight chance of snow between noon and 3pm, then a slight chance of rain and snow. Mostly sunny, with a high near 46. Chance of precipitation is 20%.

Saturday Night

Temperature: 25°F

Wind Speed: 12 mph

Wind Direction: NW

Forecast: Mostly clear, with a low around 25.

Sunday

Temperature: 39°F

Wind Speed: 13 to 18 mph

Wind Direction: NW

Forecast: Sunny, with a high near 39.

Sunday Night

Temperature: 19°F

Wind Speed: 13 mph

Wind Direction: NW

Forecast: Mostly clear, with a low around 19.

Monday

Temperature: 37°F

Wind Speed: 7 to 13 mph

Wind Direction: NW

Forecast: Sunny, with a high near 37.

Monday Night

Temperature: 20°F

Wind Speed: 5 mph

Wind Direction: W

Forecast: Mostly clear, with a low around 20.

Tuesday

Temperature: 51°F

Wind Speed: 5 to 15 mph

Wind Direction: S

Forecast: Mostly sunny, with a high near 51.

Tuesday Night

Temperature: 39°F

Wind Speed: 14 mph

Wind Direction: S

Forecast: Mostly cloudy, with a low around 39.

Wednesday

Temperature: 60°F

Wind Speed: 12 to 15 mph

Wind Direction: SW

Forecast: Mostly cloudy, with a high near 60.