Round Lake Beach Weather Forecast

    • 53
    • 74

    Chance Thunderstorms

    • 52
    • 68

    Partly Sunny

    • 53
    • 73

    Partly Sunny

    • 55
    • 76

    Mostly Sunny

    • 57
    • 77

    Partly Sunny

    • 59
    • 77

    Partly Sunny

Today 28 Aug Lake

Variable cloudiness. Isolated Showers through mid morning. A chance of Showers and Thunderstorms in the afternoon. Highs in the lower 70s. Northwest Winds 5 to 10 Mph, increasing to northeast 10 to 15 Mph in the afternoon. Chance of precipitation 30 percent.

Tonight 28 Aug Lake

Mostly clear through the early Overnight, then becoming partly cloudy. Lows in the mid 50s. Northeast Winds 5 to 10 Mph.

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Round Lake Beach Temperature Statistics

August Temperature

Chicago/Waukegan Regional Airport (11.8 miles)

  • Lowest 3 August, 2025

    54.6 °F

  • Average August

    74.6 °F

  • Highest 9 August, 2025

    96.7 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (11.8 miles)

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  • Average Low 2020–2025

    42.3 °F

  • Average 2020–2025

    51.1 °F

  • Average High 2020–2025

    59.6 °F
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