Cook County Forest Preserve Weather Forecast

    • 47
    • 70

    Mostly Sunny

    • 48
    • 66

    Mostly Sunny

    • 56
    • 69

    Mostly Sunny

    • 52
    • 72

    Partly Sunny

    • 52
    • 69

    Partly Sunny

    • 53
    • 68

    Mostly Sunny

Today 4 Oct Northern Cook

Mostly sunny. Highs around 70. West Winds 5 to 10 Mph, increasing to northwest 10 to 15 Mph in the afternoon.

Tonight 4 Oct Northern Cook

Clear. Lows in the mid 40s. Northwest Winds 5 to 10 Mph.

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Cook County Forest Preserve Temperature Statistics

October Temperature

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

  • Lowest 2 October, 2026

    52 °F

  • Average October

    62.2 °F

  • Highest 1 October, 2026

    70 °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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