Weather Forecast for Alton

Alton, IL Weather :: 39F Overcast

39F Overcast

Tonight

Mostly cloudy, with a low around 30. Northeast wind 5 to 8 mph.

Friday

A 30 percent chance of showers, mainly after 5pm. Cloudy, with a high near 45. East wind around 10 mph.

Friday Night

A slight chance of showers before midnight, then a chance of showers and thunderstorms between midnight and 3am, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 38. East wind 7 to 10 mph. Chance of precipitation is 60%.

Saturday

Showers and possibly a thunderstorm. High near 58. East wind 7 to 17 mph becoming south in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 100%.

Saturday Night

A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 35. Breezy, with a south wind 17 to 26 mph becoming west after midnight. Winds could gust as high as 45 mph. Chance of precipitation is 30%.

Sunday

Sunny, with a high near 44. Breezy.

Sunday Night

Mostly clear, with a low around 21.

Monday

Sunny, with a high near 40.

Monday Night

Partly cloudy, with a low around 25.

Tuesday

Partly sunny, with a high near 45.

Tuesday Night

Mostly cloudy, with a low around 29.

Wednesday

Partly sunny, with a high near 37.

Wednesday Night

Partly cloudy, with a low around 22.

Thursday

Mostly sunny, with a high near 39.