Direct from the National Weather Service

The Lake County IL 7 Day Weather Forecast

Rest Of Tonight
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Clear. Lows in the mid 50s. West winds 5 to 10 miles per hour.
Friday
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Mostly sunny in the morning then becoming partly cloudy. Highs in the lower 70s inland. But only in the upper 60s near the lake. Then temperatures falling into the lower 60s by evening. North winds 5 to 10 miles per hour in the morning becoming northeast and increasing to 10 to 20 miles per hour with gusts up to 30 miles per hour in the afternoon.
Friday Night
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Clear. Lows in the mid 40s. Northeast winds 10 to 15 miles per hour.
Saturday
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Sunny. Highs in the mid 60s. Northeast winds 10 to 15 miles per hour.
Saturday Night
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Clear. Lows around 50. Northeast winds 5 to 10 miles per hour.
Sunday
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Sunny. Highs around 70 inland. But only in the mid 60s near the lake.
Sunday Night
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Clear. Lows in the lower 50s.
Monday
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Sunny. Highs in the mid 70s inland. But only in the upper 60s near the lake.
Monday Night And Tuesday
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Mostly clear. Lows in the mid 50s. Highs in the lower 80s inland. But only in the mid 70s near the lake.
Tuesday Night Through Thursday
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Partly cloudy. Lows in the mid 60s. Highs in the upper 80s inland. But only in the mid 80s near the lake.