Port Vivian Weather Forecast

    • 54
    • 77

    Mostly Sunny

    • 60
    • 81

    Rain Showers

    • 53
    • 76

    Rain Showers

    • 52
    • 71

    Rain Showers Likely

    • 54
    • 73

    Partly Sunny

    • 58
    • 77

    Chance Rain Showers

Today 21 Aug Jefferson

Areas of fog Early, otherwise sunny. Highs in the mid 70s. Light Winds.

Tonight 21 Aug Jefferson

Mainly clear. Lows Ranging from the mid 50s across the tug hill to the upper 50s along the lake Ontario shore. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Port Vivian Temperature Statistics

August Temperature

Fort Drum / Wheeler-Sack U. S. Army Airfield (21.1 miles)

  • Lowest 16 August, 2026

    54.1 °F

  • Average August

    71.2 °F

  • Highest 5 August, 2026

    86.7 °F

Climate (2021–2026)

Fort Drum / Wheeler-Sack U. S. Army Airfield (21.1 miles)

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  • Average Low 2021–2026

    39.4 °F

  • Average 2021–2026

    47.8 °F

  • Average High 2021–2026

    55.9 °F
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