Cook County Forest Preserve Weather Forecast

    • 76
    • 91

    Decreasing Clouds

    • 72
    • 92

    Chance Thunderstorms

    • 66
    • 81

    Mostly Sunny

    • 65
    • 80

    Mostly Sunny

    • 69
    • 86

    Partly Sunny

    • 69
    • 86

    Chance Rain Showers

Today 26 Jul Northern Cook

Mostly cloudy in the Morning, then becoming partly cloudy. Humid. Highs around 90. Southwest Winds 5 to 10 Mph.

Tonight 26 Jul Northern Cook

Partly cloudy in the Evening, then becoming mostly cloudy. A slight chance of Showers and Thunderstorms late in the evening. A chance of Showers and Thunderstorms after midnight. Humid with Lows in the mid 70s. Southwest Winds 5 to 10 Mph. Chance of precipitation 30 percent.

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  • Temperature Real-Time

Cook County Forest Preserve Temperature Statistics

July Temperature

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

  • Lowest 23 July, 2026

    59 °F

  • Average July

    78.2 °F

  • Highest 14 July, 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

    62 °F
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