Cook County Forest Preserve Weather Forecast

    • 64
    • 78

    Mostly Sunny

    • 65
    • 79

    Mostly Sunny

    • 72
    • 86

    Partly Sunny

    • 66
    • 89

    Partly Sunny

    • 62
    • 80

    Partly Sunny

    • 63
    • 81

    Partly Sunny

Today 6 Sep Northern Cook

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the upper 70s. East Winds 5 to 10 Mph.

Tonight 6 Sep Northern Cook

Partly cloudy. Lows in the mid 60s. Northeast Winds 5 to 10 Mph.

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Cook County Forest Preserve Temperature Statistics

September Temperature

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

  • Lowest 1 September, 2026

    77.6 °F

  • Average September

    85.8 °F

  • Highest 2 September, 2026

    96.7 °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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