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Lower Flat Lake, IL Weather Forecast
Lower Flat Lake, IL Weather Forecast Date: 127 AM CDT Wed Sep 30 2026
The area/counties/county of: Greene County Il, Jersey County Il.or toggle through each period.
Rest of Tonight... Mostly cloudy and not as cool. Near steady temperature in the upper 60s. South winds around 5 mph.
Wednesday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the upper 80s. South winds 5 to 10 mph.
Wednesday Night... Mostly cloudy. Lows around 70. South winds 5 to 10 mph.
Thursday... A chance of showers in the morning, then showers with a slight chance of thunderstorms in the afternoon. Highs in the lower 80s. South winds 5 to 10 mph. Chance of rain near 100%.
Thursday Night... Showers with a slight chance of thunderstorms. Lows in the lower 60s. West winds around 5 mph, becoming northwest with gusts up to 20 mph after midnight. Chance of rain near 100%.
Friday... Partly sunny. A chance of showers in the morning. Cooler with highs around 70. Chance of rain 50%.
Friday Night... Mostly clear. Lows in the lower 50s. Highs around 70.
Saturday... Mostly clear. Lows in the lower 50s. Highs around 70.
Saturday Night... Partly cloudy in the evening, then clearing. Lows around 50.
Sunday... Mostly clear. Highs in the lower 70s. Lows in the upper 40s.
Sunday Night... Mostly clear. Highs in the lower 70s. Lows in the upper 40s.
Monday... Sunny. Highs in the upper 60s.
Monday Night... Mostly clear. Lows in the mid 40s. Highs in the upper 60s.
POP = Probability of Precipitation
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