Cook County Forest Preserve Weather Forecast

    • 68
    • 86

    Mostly Sunny

    • 75
    • 91

    Mostly Sunny

    • 77
    • 96

    Mostly Sunny

    • 74
    • 95

    Mostly Sunny

    • 73
    • 92

    Slight Chance Thunderstorms

    • 73
    • 91

    Slight Chance Thunderstorms

Today 12 Jul Northern Cook

Sunny. Highs in the upper 80s Inland, but only in the lower 80s near the lake. Northeast Winds 5 to 10 Mph.

Tonight 12 Jul Northern Cook

Clear. Lows in the upper 60s. East Winds around 5 Mph in the Evening, becoming light and variable.

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Cook County Forest Preserve Temperature Statistics

July Temperature

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

  • Lowest 7 July, 2026

    64.7 °F

  • Average July

    78.5 °F

  • Highest 1 July, 2026

    95.6 °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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