Cook County Forest Preserve Weather Forecast

    • 76
    • 82

    Slight Chance Thunderstorms

    • 79
    • 94

    Partly Sunny

    • 79
    • 96

    Mostly Sunny

    • 79
    • 97

    Hot

    • 77
    • 96

    Slight Chance Thunderstorms

    • 73
    • 93

    Chance Thunderstorms

Today 28 Jun Northern Cook

Partly cloudy in the Morning, then becoming mostly cloudy. A slight chance of Showers and Thunderstorms in the afternoon. Highs in the lower 80s Inland, but only in the mid 70s near the lake. Southeast Winds 5 to 10 Mph, increasing to 10 to 15 Mph with Gusts up to 25 Mph in the afternoon. Chance of precipitation 20 percent.

Tonight 28 Jun Northern Cook

Partly cloudy. Humid with Lows in the mid 70s. Southeast Winds 10 to 15 Mph.

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Cook County Forest Preserve Temperature Statistics

June Temperature

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

  • Lowest 2 June, 2026

    50.6 °F
  • Average June

    70.2 °F
  • Highest 10 June, 2026

    91.7 °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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