Rondout Reservoir Weather Forecast

    • 54
    • 81

    Mostly Sunny

    • 53
    • 77

    Partly Sunny

    • 55
    • 74

    Mostly Cloudy

    • 56
    • 80

    Mostly Sunny

    • 49
    • 79

    Mostly Sunny

    • 45
    • 70

    Partly Sunny

Today 15 Sep Western Ulster

Sunny. Highs around 80. East Winds around 5 Mph.

Tonight 15 Sep Western Ulster

Partly cloudy. Patchy fog after midnight. Lows in the lower 50s. Light and variable Winds.

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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

    46.3 °F

  • Average High 2020–2025

    55.6 °F
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