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Illiopolis High School, IL Weather Forecast
Illiopolis High School, IL Weather Forecast Date: 637 AM CDT Sat Aug 15 2026
The area/counties/county of: Sangamon, including the city of Springfield.or toggle through each period.
Today... Showers with a chance of thunderstorms this morning, then partly sunny this afternoon. Highs in the upper 80s. Southeast winds 5 to 10 mph with gusts up to 20 mph, becoming southwest this afternoon. Chance of rain near 100%. Heat index values up to 102 this afternoon.
Tonight... Partly cloudy. A chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 40%.
Sunday... Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the upper 80s. West winds 5 to 10 mph. Chance of rain 30%. Heat index values up to 100.
Sunday Night... Partly cloudy. Humid with lows in the upper 60s. Northwest winds 5 to 10 mph.
Monday... Mostly sunny. Highs in the mid 80s. North winds around 5 mph.
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... Mostly clear in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 50%.
Wednesday... Partly sunny. A chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 50%.
Wednesday Night... Partly cloudy. Lows in the lower 60s. Highs in the upper 70s.
Thursday... Partly cloudy. Lows in the lower 60s. Highs in the upper 70s.
POP = Probability of Precipitation
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