Winnetka Weather Forecast

    • 62
    • 77

    Mostly Sunny

    • 66
    • 79

    Partly Sunny

    • 63
    • 76

    Mostly Cloudy

    • 64
    • 76

    Slight Chance Thunderstorms

    • 64
    • 80

    Chance Thunderstorms

    • 64
    • 80

    Chance Rain Showers

Today 17 Sep Northern Cook

Mostly sunny. Highs in the mid 80s Inland, but only in the mid 70s near the lake. Northeast Winds 5 to 10 Mph.

Tonight 17 Sep Northern Cook

Mostly clear. Lows in the lower 60s. East Winds around 5 Mph, becoming south after midnight.

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Winnetka Temperature Statistics

September Temperature

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

  • Lowest 7 September, 2025

    46.9 °F

  • Average September

    65.4 °F

  • Highest 12 September, 2025

    84.9 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    44.1 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    61.5 °F
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