Chappaqua Weather Forecast

    • 59
    • 70

    Chance Rain Showers

    • 59
    • 79

    Slight Chance Rain Showers

    • 50
    • 79

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 52
    • 72

    Partly Sunny

    • 57
    • 77

    Partly Sunny

Today 17 Sep Northern Westchester

Mostly cloudy. A slight chance of Showers this Morning, then a chance of Showers this afternoon. Highs around 70. East Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 17 Sep Northern Westchester

Mostly cloudy with a 50 percent chance of Showers. Lows in the upper 50s. Northeast Winds around 5 Mph.

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Chappaqua Temperature Statistics

September Temperature

White Plains - Westchester County Airport (7.5 miles)

  • Lowest 8 September, 2025

    48.9 °F

  • Average September

    66.2 °F

  • Highest 6 September, 2025

    82 °F

Climate (2020–Present)

White Plains - Westchester County Airport (7.5 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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