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Smith Lake, IL Weather Forecast
Smith Lake, IL Weather Forecast Date: 1237 PM CDT Mon Sep 21 2026
The area/counties/county of: Mason, including the city of Havana.or toggle through each period.
This Afternoon... Cloudy with a chance of sprinkles. Cooler. Near steady temperature in the mid 60s. Northeast winds 5 to 10 mph.
Tonight... Mostly cloudy with a chance of sprinkles. Lows in the upper 50s. Northeast winds 5 to 10 mph.
Tuesday... Mostly cloudy with a chance of sprinkles in the morning, then partly sunny in the afternoon. Highs in the upper 60s. Northeast winds 5 to 10 mph with gusts up to 20 mph.
Tuesday Night... Partly cloudy in the evening, then clearing. Lows in the lower 50s. Northeast winds 5 to 10 mph.
Wednesday... Sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.
Wednesday Night... Partly cloudy. Lows in the lower 50s. Highs in the lower 70s.
Thursday... Partly cloudy. Lows in the lower 50s. Highs in the lower 70s.
Friday... Partly sunny. Highs in the lower 70s.
Friday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 50s.
Saturday... Partly sunny. Highs in the lower 70s.
Saturday Night... Partly cloudy. Lows in the mid 50s. Highs in the upper 70s.
POP = Probability of Precipitation
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