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Denison, IL Weather Forecast
Denison, IL Weather Forecast Date: 637 PM CDT Tue Sep 08 2026
The area/counties/county of: Lawrence, including the city of Lawrenceville.or toggle through each period.
Tonight... Mostly clear. Not as cool with lows in the lower 70s. South winds 5 to 10 mph.
Wednesday... Sunny. A chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Southwest winds 10 to 15 mph. Chance of rain 30%. Heat index values up to 104.
Wednesday Night... Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Humid with lows around 70. Southwest winds 5 to 10 mph. Chance of rain 90%.
Thursday... Showers with a chance of thunderstorms in the morning, then showers likely in the afternoon. Not as warm. Humid with highs in the lower 80s. West winds around 5 mph. Chance of rain near 100%.
Thursday Night... Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 60s. Northeast winds around 5 mph.
Friday... Mostly sunny. Highs in the mid 80s.
Friday Night... Mostly clear. Lows in the mid 60s.
Saturday... Partly cloudy. Highs in the lower 90s. Lows in the upper 60s.
Sunday... Partly cloudy. Highs in the lower 90s. Lows in the upper 60s.
Monday... Sunny. Highs in the lower 90s.
Monday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 60s.
POP = Probability of Precipitation
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