Cos Cob Weather Forecast

    • 52
    • 70

    Rain

    • 53
    • 75

    Mostly Sunny

    • 54
    • 74

    Mostly Cloudy

    • 54
    • 73

    Partly Sunny

    • 56
    • 81

    Mostly Sunny

    • 54
    • 75

    Mostly Sunny

    • 55
    • 75

    Partly Sunny

Today 7 Sep Southern Fairfield

Cloudy with a 50 percent chance of Showers. Highs in the upper 60s. Northwest Winds 5 to 10 Mph.

Tonight 7 Sep Southern Fairfield

Partly cloudy this Evening, then clearing. Lows in the lower 50s. West Winds around 5 Mph, becoming north after midnight.

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Cos Cob Temperature Statistics

September Temperature

White Plains - Westchester County Airport (5.6 miles)

  • Lowest 3 September, 2025

    55.9 °F

  • Average September

    67.3 °F

  • Highest 5 September, 2025

    81 °F

Climate (2020–Present)

White Plains - Westchester County Airport (5.6 miles)

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  • Average Low 2020–2025

    45.9 °F

  • Average 2020–2025

    54.1 °F

  • Average High 2020–2025

    62.3 °F
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