Cook County Forest Preserve Weather Forecast

    • 58
    • 76

    Mostly Sunny

    • 60
    • 78

    Mostly Sunny

    • 65
    • 81

    Partly Sunny

    • 67
    • 84

    Chance Thunderstorms

    • 65
    • 82

    Slight Chance Thunderstorms

    • 65
    • 81

    Partly Sunny

Today 23 Aug Northern Cook

Sunny in the Morning, then becoming partly cloudy. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 23 Aug Northern Cook

Mostly clear. Lows in the upper 50s. Northwest Winds 5 to 10 Mph.

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Cook County Forest Preserve Temperature Statistics

August Temperature

Chicago, Chicago-O'Hare International Airport (2.5 miles)

  • Lowest 20 August, 2026

    62.1 °F

  • Average August

    75.4 °F

  • Highest 7 August, 2026

    87.7 °F

Climate (2021–2026)

Chicago, Chicago-O'Hare International Airport (2.5 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    53.5 °F

  • Average High 2021–2026

    61.9 °F
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