Port Vivian Weather Forecast
- 55
- 74
Partly Sunny
- 44
- 68
Partly Sunny
- 48
- 65
Rain Showers Likely
- 46
- 65
Partly Sunny
- 44
- 62
Partly Sunny
- 44
- 62
Partly Sunny
- 47
- 64
Mostly Cloudy
Today 17 Sep Jefferson
Partly sunny with a 30 percent chance of Showers. Highs in the mid 60s.
Tonight 17 Sep Jefferson
Mostly cloudy with a chance of Showers Early, then mostly cloudy from late evening on. Lows Ranging from the mid 50s across the tug hill to the upper 50s along the lake Ontario shore. Light northwest Winds. Chance of rain 30 percent.
Port Vivian Temperature Statistics
September Temperature
Fort Drum / Wheeler-Sack U. S. Army Airfield (21.1 miles)
Lowest 11 September, 2026
48.2 °FAverage September
66.1 °FHighest 2 September, 2026
82.2 °F
Climate (2021–2026)
Fort Drum / Wheeler-Sack U. S. Army Airfield (21.1 miles)
Average Low 2021–2026
39.3 °FAverage 2021–2026
47.8 °FAverage High 2021–2026
55.9 °F