Summit Weather Forecast

    • 71
    • 85

    Slight Chance Thunderstorms

    • 66
    • 84

    Chance Rain Showers

    • 71
    • 84

    Chance Thunderstorms

    • 70
    • 85

    Rain Showers Likely

    • 66
    • 80

    Chance Thunderstorms

    • 65
    • 79

    Chance Thunderstorms

Today 7 Aug Central Cook

Mostly cloudy in the Morning, then becoming partly cloudy. Patchy fog early in the morning. Humid. Highs in the mid 80s. South Winds 5 to 10 Mph.

Tonight 7 Aug Central Cook

Partly cloudy. A slight chance of Showers and Thunderstorms early in the Evening, then a chance of Showers and Thunderstorms late in the evening. A slight chance of Showers and Thunderstorms after midnight. Humid with Lows in the lower 70s. Southwest Winds around 5 Mph. Chance of precipitation 30 percent.

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Summit Temperature Statistics

August Temperature

Chicago, Chicago Midway Airport (2.5 miles)

  • Lowest 3 August, 2026

    63 °F

  • Average August

    72.9 °F

  • Highest 4 August, 2026

    84.9 °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

    62 °F
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