Winnetka Weather Forecast

    • 67
    • 82

    Rain Showers Likely

    • 64
    • 75

    Slight Chance Thunderstorms

    • 64
    • 77

    Mostly Sunny

    • 65
    • 80

    Chance Thunderstorms

    • 62
    • 77

    Slight Chance Thunderstorms

    • 62
    • 74

    Partly Sunny

    • 64
    • 76

    Partly Sunny

Today 18 Aug Northern Cook

Mostly cloudy. A chance of Showers and a slight chance of Thunderstorms. Temperatures in the upper 70s. Southwest Winds 10 to 15 Mph. Chance of precipitation 30 percent.

Tonight 18 Aug Northern Cook

Mostly cloudy. Showers with Thunderstorms likely late in the Evening, then a slight chance of Showers and Thunderstorms after midnight. Patchy fog late. Lows in the mid 60s. West Winds 5 to 10 Mph. Chance of precipitation 90 percent.

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Winnetka Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    61.6 °F

  • Average August

    74.6 °F

  • Highest 7 August, 2026

    87.7 °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

    52.9 °F

  • Average High 2021–2026

    61.6 °F
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