Illinois Beach State Park Weather Forecast

    • 44
    • 55

    Rain Showers Likely

    • 41
    • 51

    Breezy

    • 39
    • 53

    Partly Sunny

    • 45
    • 58

    Mostly Cloudy

    • 49
    • 57

    Chance Rain Showers

    • 52
    • 60

    Slight Chance Rain Showers

Today 21 Oct Lake

Partly cloudy in the Morning, then becoming mostly cloudy. A chance of Showers early in the afternoon. Showers likely late. Windy. Highs in the mid 50s. West Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming 15 to 25 Mph with Gusts up to 40 Mph in the afternoon. Chance of precipitation 60 percent.

Tonight 21 Oct Lake

Mostly cloudy. Showers likely early in the evening. Breezy with Lows in the lower 40s. West Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of precipitation 60 percent.

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  • Temperature Real-Time

Illinois Beach State Park Temperature Statistics

October Temperature

Chicago/Waukegan Regional Airport (2.5 miles)

  • Lowest 9 October, 2025

    39.9 °F

  • Average October

    63.3 °F

  • Highest 3 October, 2025

    90 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (2.5 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    59.7 °F
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