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Gillespie, IL Weather Forecast
Gillespie, IL Weather Forecast Date: 543 PM CDT Mon Sep 14 2026
The area/counties/county of: Greene County Il, Jersey County Il.or toggle through each period.
Tonight... Mostly clear. Not as cool with lows around 70. Southeast winds 10 to 15 mph with gusts up to 25 mph.
Tuesday... Mostly sunny. A chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Chance of rain 50%. Heat index values up to 103.
Tuesday Night... Mostly cloudy with scattered showers and thunderstorms. Lows in the upper 60s. East winds around 5 mph. Chance of rain 50%.
Wednesday... Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs in the lower 90s. East winds around 5 mph, becoming south in the afternoon. Chance of rain 50%. Heat index values up to 100 in the afternoon.
Wednesday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s. South winds around 5 mph.
Thursday... Mostly clear. Hot. Highs in the mid 90s. Lows around 70. Heat index values up to 100.
Thursday Night... Mostly clear. Hot. Highs in the mid 90s. Lows around 70. Heat index values up to 100.
Friday... Mostly sunny. Highs in the lower 90s.
Friday Night... Mostly clear. Lows in the lower 70s. Highs in the lower 90s.
Saturday... Mostly clear. Lows in the lower 70s. Highs in the lower 90s.
Saturday Night... Partly cloudy with a 20% chance of showers. Lows in the upper 60s.
Sunday... Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20%.
Sunday Night... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. Highs in the lower 80s. Chance of rain 30%.
POP = Probability of Precipitation
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