Cos Cob Weather Forecast

    • 59
    • 67

    Rain Showers

    • 56
    • 64

    Rain Showers

    • 58
    • 71

    Mostly Cloudy

    • 61
    • 75

    Mostly Cloudy

    • 64
    • 78

    Mostly Cloudy

    • 57
    • 75

    Mostly Cloudy

    • 53
    • 69

    Partly Sunny

Today 27 Sep Southern Fairfield

Partly sunny with a 30 percent chance of Showers. Highs in the mid 60s.

Tonight 27 Sep Southern Fairfield

Rain with a slight chance of Thunderstorms. Lows in the upper 50s. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain near 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cos Cob Temperature Statistics

September Temperature

White Plains - Westchester County Airport (5.6 miles)

  • Lowest 24 September, 2026

    48.9 °F

  • Average September

    66.7 °F

  • Highest 10 September, 2026

    84 °F

Climate (2021–2026)

White Plains - Westchester County Airport (5.6 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    54 °F

  • Average High 2021–2026

    62.2 °F
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