Winnetka Weather Forecast

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    • 63

    Mostly Cloudy

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    • 62

    Mostly Cloudy

    • 56
    • 65

    Mostly Cloudy

    • 56
    • 65

    Mostly Cloudy

    • 54
    • 65

    Partly Sunny

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    • 65

    Mostly Cloudy

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    • 68

    Mostly Cloudy

Today 21 Sep Northern Cook

Mostly cloudy. A slight chance of Showers early in the afternoon. Near steady temperature in the lower 60s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of precipitation 20 percent.

Tonight 21 Sep Northern Cook

Cloudy. Lows in the mid 50s. Northeast Winds 10 to 15 Mph.

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Winnetka Temperature Statistics

September Temperature

Chicago / Wheeling, Pal-Waukee Airport (8.7 miles)

  • Lowest 14 September, 2026

    50.6 °F

  • Average September

    72.9 °F

  • Highest 2 September, 2026

    96.7 °F

Climate (2021–2026)

Chicago / Wheeling, Pal-Waukee Airport (8.7 miles)

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  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    61.5 °F
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