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Roundhouse Lake, IL Weather Forecast
Roundhouse Lake, IL Weather Forecast Date: 547 AM CDT Mon Sep 14 2026
The area/counties/county of: Knox, including the city of Galesburg.or toggle through each period.
Today... Partly sunny. Highs in the upper 70s. Southeast winds 10 to 15 mph with gusts up to 25 mph.
Tonight... Mostly clear in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Not as cool with lows around 70. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 50%.
Tuesday... Partly sunny. Showers likely with a chance of thunderstorms in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. More humid with highs in the lower 80s. Southwest winds 10 to 15 mph, becoming northwest 5 to 10 mph in the afternoon. Chance of rain 70%.
Tuesday Night... A chance of thunderstorms. Showers. Lows in the mid 60s. Northeast winds 5 to 10 mph. Chance of rain 90%.
Wednesday... Showers, mainly in the morning. Highs in the lower 80s. East winds 5 to 10 mph. Chance of rain 90%.
Wednesday Night... Mostly cloudy. A chance of showers. Lows in the upper 60s. Chance of rain 50%.
Thursday... Showers likely in the morning, then partly sunny in the afternoon. Highs in the lower 80s. Chance of rain 60%.
Thursday Night... Mostly cloudy. A chance of showers after midnight. Lows in the mid 60s. Chance of rain 40%.
Friday... Partly sunny with a chance of showers. Highs in the lower 80s. Chance of rain 40%.
Friday Night... Partly cloudy with a 40% chance of showers. Lows in the mid 60s.
Saturday... Partly sunny with a 50% chance of showers. Highs around 80.
Saturday Night... Mostly cloudy with a chance of showers. Lows in the lower 60s. Chance of rain 40%.
POP = Probability of Precipitation
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