Rock Lake Weather Forecast

    • 60
    • 74

    Rain Showers

    • 60
    • 81

    Chance Rain Showers

    • 57
    • 80

    Mostly Sunny

    • 58
    • 82

    Mostly Cloudy

    • 52
    • 75

    Slight Chance Rain Showers

    • 54
    • 77

    Mostly Cloudy

    • 56
    • 77

    Slight Chance Rain Showers

Today 16 Aug Sullivan

Showers. Highs in the mid 70s. South Winds 5 to 10 Mph. Chance of rain 80 percent.

Tonight 16 Aug Sullivan

A slight chance of Thunderstorms. Showers. Patchy fog after midnight. Lows in the upper 50s. South Winds 5 to 10 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Lake Temperature Statistics

August Temperature

Monticello, Sullivan County International Airport (14.3 miles)

  • Lowest 4 August, 2026

    53.1 °F

  • Average August

    70.9 °F

  • Highest 6 August, 2026

    87.1 °F

Climate (2021–2026)

Monticello, Sullivan County International Airport (14.3 miles)

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  • Average Low 2021–2026

    36.5 °F

  • Average 2021–2026

    45.9 °F

  • Average High 2021–2026

    55.1 °F
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