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Illiopolis, IL Weather Forecast
Illiopolis, IL Weather Forecast Date: 437 PM CDT Mon Oct 05 2026
The area/counties/county of: Sangamon, including the city of Springfield.or toggle through each period.
Tonight... Clear. Lows in the upper 40s. East winds around 5 mph.
Tuesday... Sunny. Highs in the upper 70s. South winds 5 to 10 mph.
Tuesday Night... Mostly clear. Lows in the mid 50s. South winds around 5 mph.
Wednesday... Sunny. Highs in the mid 80s. West winds 5 to 10 mph.
Wednesday Night... Mostly clear. Lows in the mid 50s. North winds around 5 mph in the evening, becoming light and variable.
Thursday... Mostly clear. Highs in the upper 70s. Lows in the lower 50s.
Friday... Mostly clear. Highs in the upper 70s. Lows in the lower 50s.
Saturday... Sunny. Highs in the lower 80s.
Saturday Night... Mostly clear. Lows in the upper 50s.
Sunday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s.
Monday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s.
Tuesday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s.
Wednesday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s.
Thursday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s.
POP = Probability of Precipitation
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