Rondout Reservoir Weather Forecast

    • 46
    • 65

    Chance Rain Showers

    • 44
    • 59

    Chance Rain Showers

    • 43
    • 61

    Mostly Cloudy

    • 45
    • 60

    Mostly Cloudy

    • 46
    • 63

    Chance Rain Showers

    • 48
    • 65

    Slight Chance Rain Showers

Today 21 Sep Western Ulster

Partly sunny. Highs in the lower 60s. Northeast Winds 5 to 10 Mph.

Tonight 21 Sep Western Ulster

Cloudy. Lows in the mid 40s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rondout Reservoir Temperature Statistics

September Temperature

Monticello, Sullivan County International Airport (18.6 miles)

  • Lowest 15 September, 2026

    42.1 °F

  • Average September

    64.9 °F

  • Highest 3 September, 2026

    81 °F

Climate (2021–2026)

Monticello, Sullivan County International Airport (18.6 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    45.9 °F

  • Average High 2021–2026

    55.2 °F
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