62002 Weather (Alton, IL)

Weather forecast for: Alton IL

Last Update: 3:16 pm CDT Sep 11, 2026

Tonight: Cloudy during the early evening, then gradual clearing, with a low around 68. Southeast wind 5 to 7 mph becoming calm in the evening.

Saturday: Mostly sunny, with a high near 91. Light and variable wind becoming southwest around 6 mph in the morning.

Saturday Night: Partly cloudy, with a low around 69. Northwest wind around 5 mph becoming calm after midnight.

Sunday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 89. Calm wind becoming north 5 to 8 mph in the afternoon. Chance of precipitation is 30%.

Sunday Night: Partly cloudy, with a low around 65. East wind around 8 mph.

Monday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 89. Chance of precipitation is 20%.

Monday Night: Mostly clear, with a low around 70.

Tuesday: Sunny, with a high near 95.

Tuesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 20%.

Wednesday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 93. Chance of precipitation is 20%.

Wednesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.

Thursday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.

Thursday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.

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