Cook County Forest Preserve Weather Forecast

    • 69
    • 82

    Partly Sunny

    • 73
    • 88

    Partly Sunny

    • 80
    • 96

    Hot

    • 74
    • 97

    Chance Thunderstorms

    • 72
    • 89

    Chance Thunderstorms

    • 72
    • 88

    Chance Thunderstorms

    • 73
    • 91

    Slight Chance Thunderstorms

Today 21 Jul Northern Cook

Partly cloudy late in the Morning, then becoming mostly sunny. Hazy late in the morning. Highs in the lower 80s Inland, but only in the upper 70s near the lake. East Winds around 10 Mph.

Tonight 21 Jul Northern Cook

Partly cloudy. Lows in the upper 60s. East Winds 5 to 10 Mph, becoming southeast after midnight.

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Cook County Forest Preserve Temperature Statistics

July Temperature

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

  • Lowest 17 July, 2025

    58.6 °F

  • Average July

    77.9 °F

  • Highest 3 July, 2025

    95.6 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.4 °F

  • Average 2020–2025

    53.4 °F

  • Average High 2020–2025

    61.7 °F
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