South Mountain County Park Weather Forecast

    • 57
    • 79

    Partly Sunny

    • 58
    • 76

    Chance Rain Showers

    • 59
    • 70

    Chance Rain Showers

    • 60
    • 81

    Mostly Sunny

    • 52
    • 82

    Mostly Sunny

    • 51
    • 70

    Mostly Sunny

    • 54
    • 72

    Partly Sunny

Today 15 Sep Rockland

Partly sunny. Near steady temperature in the upper 70s. East Winds 5 to 10 Mph.

Tonight 15 Sep Rockland

Partly cloudy. Lows in the upper 50s. Southeast Winds around 5 Mph, becoming northeast after midnight.

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South Mountain County Park Temperature Statistics

September Temperature

White Plains - Westchester County Airport (18.6 miles)

  • Lowest 8 September, 2025

    48.9 °F

  • Average September

    66 °F

  • Highest 6 September, 2025

    82 °F

Climate (2020–Present)

White Plains - Westchester County Airport (18.6 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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