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Back Lake, IL 7-Day Night Weather Forecast
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Back Lake, IL Weather Forecast
Back Lake, IL Weather Forecast Date: 207 PM CDT Fri Sep 18 2026
The area/counties/county of: Mason, including the city of Havana.or toggle through each period.
This Afternoon... Mostly sunny with a 20% chance of showers. Not as warm. Near steady temperature in the lower 80s. East winds 5 to 10 mph.
Tonight... Partly cloudy. Lows in the lower 70s. Southeast winds 5 to 10 mph.
Saturday... Partly sunny with a slight chance of showers in the morning, then mostly cloudy in the afternoon. Humid with highs around 90. South winds 5 to 10 mph. Chance of rain 20%.
Saturday Night... Mostly cloudy. A chance of showers after midnight. Lows in the upper 60s. South winds around 5 mph, becoming north with gusts up to 20 mph after midnight. Chance of rain 50%.
Sunday... Showers likely. Highs in the lower 80s. North winds 5 to 10 mph. Chance of rain 70%.
Sunday Night... Showers likely with a chance of thunderstorms. Lows around 60. Highs in the upper 60s. Chance of rain 70%.
Monday... Showers likely with a chance of thunderstorms. Lows around 60. Highs in the upper 60s. Chance of rain 70%.
Monday Night... Mostly cloudy. A chance of showers after midnight. Lows in the mid 50s. Chance of rain 50%.
Tuesday... Mostly cloudy. Highs in the upper 60s. Lows in the lower 50s.
Wednesday... Mostly cloudy. Highs in the upper 60s. Lows in the lower 50s.
Wednesday Night... Partly cloudy. Lows in the lower 50s. Highs in the lower 70s.
POP = Probability of Precipitation
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