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Illiopolis, IL 7-Day Night Weather Forecast
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Illiopolis, IL Weather Forecast
Illiopolis, IL Weather Forecast Date: 437 AM CDT Fri Oct 09 2026
The area/counties/county of: Sangamon, including the city of Springfield.or toggle through each period.
Today... Mostly sunny. Highs in the upper 80s. South winds 5 to 10 mph.
Tonight... Mostly clear. Lows in the upper 50s. South winds 5 to 10 mph.
Saturday... Partly sunny in the morning, then becoming mostly cloudy. Highs in the lower 80s. Southeast winds 5 to 10 mph.
Saturday Night... Mostly cloudy. Lows in the upper 50s. East winds 5 to 10 mph.
Sunday... Sunny. Highs around 80. Northeast winds around 5 mph, becoming north around 5 mph in the afternoon.
Sunday Night... Mostly clear. Lows in the upper 50s. Highs in the upper 80s.
Columbus Day... Mostly clear. Lows in the upper 50s. Highs in the upper 80s.
Monday Night... Mostly clear. Lows in the mid 60s. Highs in the mid 80s.
Tuesday... Mostly clear. Lows in the mid 60s. Highs in the mid 80s.
Tuesday Night... Partly cloudy. Lows in the upper 50s.
Wednesday... Partly sunny with a chance of showers. Highs in the upper 70s. Chance of rain 50%.
Wednesday Night... A chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the lower 60s. Chance of rain 50%.
POP = Probability of Precipitation
Illiopolis Radar Loop
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