Rondout Reservoir Weather Forecast

    • 56
    • 80

    Mostly Sunny

    • 44
    • 77

    Mostly Sunny

    • 43
    • 69

    Mostly Sunny

    • 47
    • 70

    Partly Sunny

    • 56
    • 76

    Partly Sunny

    • 59
    • 81

    Partly Sunny

Today 18 Sep Western Ulster

Patchy fog this morning. Sunny, warmer with Highs in the upper 70s. Light and variable Winds, becoming northwest around 5 Mph this afternoon.

Tonight 18 Sep Western Ulster

Mostly clear. Lows in the mid 50s. Northwest Winds around 5 Mph.

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Rondout Reservoir Temperature Statistics

September Temperature

Monticello, Sullivan County International Airport (18.6 miles)

  • Lowest 2 September, 2025

    48.2 °F

  • Average September

    48.2 °F

  • Highest 2 September, 2025

    48.2 °F

Climate (2020–Present)

Monticello, Sullivan County International Airport (18.6 miles)

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  • Average Low 2020–2025

    37 °F

  • Average 2020–2025

    46.2 °F

  • Average High 2020–2025

    55.6 °F
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