Summit Weather Forecast

    • 65
    • 83

    Partly Sunny

    • 69
    • 82

    Mostly Cloudy

    • 74
    • 87

    Slight Chance Thunderstorms

    • 75
    • 89

    Slight Chance Thunderstorms

    • 74
    • 90

    Slight Chance Thunderstorms

    • 73
    • 89

    Chance Rain Showers

Today 28 Aug Central Cook

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 28 Aug Central Cook

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 60s. South Winds around 5 Mph.

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Summit Temperature Statistics

August Temperature

Chicago, Chicago Midway Airport (2.5 miles)

  • Lowest 24 August, 2026

    59 °F

  • Average August

    74.1 °F

  • Highest 10 August, 2026

    87.1 °F

Climate (2021–2026)

Chicago, Chicago Midway Airport (2.5 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    54.3 °F

  • Average High 2021–2026

    61.9 °F
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