Sun Lake Forest Preserve Weather Forecast

    • 67
    • 76

    Chance Thunderstorms

    • 71
    • 87

    Chance Thunderstorms

    • 65
    • 85

    Chance Thunderstorms

    • 61
    • 76

    Partly Sunny

    • 61
    • 79

    Mostly Sunny

    • 63
    • 84

    Mostly Sunny

Today 17 Aug Lake

Mostly cloudy through mid Afternoon, then becoming partly cloudy. A chance of Showers and Thunderstorms through mid morning. Highs in the upper 70s. Northeast Winds 5 to 10 Mph. Chance of precipitation 30 percent.

Tonight 17 Aug Lake

Partly cloudy. Lows in the upper 60s. Northeast Winds around 10 Mph, becoming east after midnight.

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Sun Lake Forest Preserve Temperature Statistics

August Temperature

Chicago/Waukegan Regional Airport (10.6 miles)

  • Lowest 3 August, 2025

    54.6 °F

  • Average August

    75.3 °F

  • Highest 9 August, 2025

    96.7 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (10.6 miles)

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  • Average Low 2020–2025

    42.3 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    59.6 °F
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