Waukegan Weather Forecast

    • 46
    • 66

    Decreasing Clouds

    • 49
    • 65

    Mostly Sunny

    • 57
    • 71

    Partly Sunny

    • 60
    • 77

    Mostly Cloudy

    • 62
    • 76

    Partly Sunny

    • 60
    • 72

    Partly Sunny

Today 6 Sep Lake

Partly cloudy early to mid Afternoon, then becoming mostly cloudy. Highs in the lower 60s. West Winds 10 to 20 Mph with Gusts up to 25 Mph.

Tonight 6 Sep Lake

Mostly cloudy early in the evening then clearing. A slight chance of Showers early in the evening. Lows in the lower 40s. West Winds 5 to 10 Mph. Chance of precipitation 20 percent.

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Waukegan Temperature Statistics

September Temperature

Chicago/Waukegan Regional Airport (3.7 miles)

  • Lowest 4 September, 2025

    46 °F

  • Average September

    63.4 °F

  • Highest 2 September, 2025

    79 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (3.7 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    59.5 °F
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