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Jack Lake, IL Weather Forecast
Jack Lake, IL Weather Forecast Date: 127 AM CDT Tue Sep 15 2026
The area/counties/county of: Mason, including the city of Havana.or toggle through each period.
Rest of Tonight... Partly cloudy and not as cool. Near steady temperature in the lower 70s. South winds 10 to 15 mph with gusts up to 25 mph.
Tuesday... Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. More humid with highs in the lower 90s. South winds 5 to 10 mph with gusts up to 25 mph, becoming west in the afternoon. Chance of rain 50%. Heat index values up to 101.
Tuesday Night... A chance of thunderstorms. Showers likely. Lows in the mid 60s. North winds around 5 mph. Chance of rain 70%.
Wednesday... Mostly cloudy in the morning, then becoming partly sunny. A chance of thunderstorms in the morning. A chance of showers. Humid with highs in the mid 80s. Northeast winds around 5 mph. Chance of rain 50%.
Wednesday Night... Partly cloudy. A chance of showers after midnight. Humid with lows around 70. East winds around 5 mph, becoming southeast after midnight. Chance of rain 40%.
Thursday... Mostly sunny. A chance of showers in the morning. Highs in the upper 80s. Chance of rain 40%.
Thursday Night... Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 30%.
Friday... A chance of showers in the morning. Mostly sunny. Highs in the upper 80s. Chance of rain 40%.
Friday Night... Partly cloudy. Lows in the upper 60s. Highs in the upper 80s.
Saturday... Partly cloudy. Lows in the upper 60s. Highs in the upper 80s.
Saturday Night... Mostly cloudy. A chance of showers in the evening, then showers likely after midnight. Lows in the mid 60s. Chance of rain 60%.
Sunday... Partly sunny with a chance of showers. Cooler with highs in the upper 70s. Chance of rain 50%.
Sunday Night... Mostly cloudy. Lows in the upper 50s.
POP = Probability of Precipitation
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