Weather forecast for: Illiopolis IL
Last Update: 12:36 am CDT Oct 9, 2026
Overnight: Mostly clear, with a low around 52. Southeast wind 3 to 5 mph.
Friday: Mostly sunny, with a high near 86. South southeast wind 5 to 13 mph, with gusts as high as 18 mph.
Friday Night: Clear, with a low around 60. South southeast wind around 9 mph, with gusts as high as 16 mph.
Saturday: Increasing clouds, with a high near 84. South wind 7 to 10 mph, with gusts as high as 15 mph.
Saturday Night: Mostly cloudy, with a low around 59. Southeast wind 7 to 9 mph.
Sunday: Partly sunny, with a high near 78. East wind around 6 mph becoming north northwest in the afternoon.
Sunday Night: Mostly clear, with a low around 57. Light and variable wind.
Columbus Day: Sunny, with a high near 87.
Monday Night: Mostly clear, with a low around 64.
Tuesday: Sunny, with a high near 80.
Tuesday Night: A chance of showers. Partly cloudy, with a low around 55.
Wednesday: A chance of showers. Mostly cloudy, with a high near 77.
Wednesday Night: A chance of showers. Partly cloudy, with a low around 58.
Thursday: A chance of showers. Mostly sunny, with a high near 79.
WeatherWorld.com
