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Cornwall, IL 7-Day Night Weather Forecast
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Cornwall, IL Weather Forecast
Cornwall, IL Weather Forecast Date: 541 PM CDT Thu Sep 03 2026
The area/counties/county of: Henry County Il, including the city of Geneseo.or toggle through each period.
Tonight... Mostly clear. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 102 early this evening.
Friday... Sunny, hot with highs in the mid 90s. South winds 5 to 10 mph, becoming southwest in the afternoon. Heat index values up to 105.
Friday Night... Mostly clear. A chance of showers after midnight. Humid with lows in the lower 70s. Southwest winds 5 to 10 mph. Chance of rain 30%. Heat index values up to 103 early in the evening.
Saturday... Sunny, hot with highs in the lower 90s. North winds 5 to 10 mph. Heat index values up to 101.
Saturday Night... Mostly clear. Humid with lows in the upper 60s. Northeast winds 5 to 10 mph.
Sunday... Mostly sunny. Highs in the mid 80s.
Sunday Night... Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 60s.
Labor Day... Partly cloudy. Highs in the mid 80s. Lows in the mid 60s.
Monday Night... Partly cloudy. Highs in the mid 80s. Lows in the mid 60s.
Tuesday... Mostly sunny. Hot with highs in the lower 90s.
Tuesday Night... Mostly clear in the evening, then partly cloudy with a chance of showers after midnight. Lows in the lower 70s. Chance of rain 30%.
Wednesday... Mostly sunny. Hot with highs in the lower 90s.
Wednesday Night... Partly cloudy. A chance of showers after midnight. Lows around 70. Chance of rain 30%.
POP = Probability of Precipitation
Cornwall Radar Loop
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