Summit Weather Forecast

    • 66
    • 80

    Increasing Clouds

    • 65
    • 85

    Partly Sunny

    • 62
    • 77

    Chance Thunderstorms

    • 70
    • 80

    Chance Rain Showers

    • 64
    • 82

    Rain Showers Likely

    • 65
    • 75

    Rain Showers Likely

Today 11 Sep Central Cook

Sunny. Highs around 80 Inland, but only in the mid 70s near the lake. Southeast Winds around 5 Mph.

Tonight 11 Sep 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

September Temperature

Chicago, Chicago Midway Airport (2.5 miles)

  • Lowest 8 September, 2026

    66 °F

  • Average September

    79.8 °F

  • Highest 2 September, 2026

    96.1 °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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