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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est wed dec 17 2025

for waters beyond five nautical miles of shore on lake ontario

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...a 29.1 inch low near lake superior thursday will deepen 
to 28.9 inches while moving to central quebec by friday, with its 
trailing strong cold front crossing the lake early friday morning. 
in its wake, a 30.1 inch high will slowly build across the lake 
friday night and early saturday, then will drift off the atlantic 
coastline later saturday and saturday night, with a 29.5 inch low 
moving across ontario and quebec and pushing its attendant cold 
front across the lake sunday. a large 30.6 inch high will then build 
east across the lake monday.


loz064-065-181000-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 pm est wed dec 17 2025

...gale watch in effect from thursday evening through late friday
night...

.overnight...west winds 15 to 20 knots becoming south.
waves 4 to 7 feet subsiding to 2 to 4 feet. waves occasionally
around 9 feet. 
.thursday...south winds to 30 knots. waves 3 to 5 feet building
to 6 to 9 feet. waves occasionally around 11 feet. 
.thursday night...south gales to 35 knots. showers. waves 7 to
10 feet. waves occasionally around 13 feet. 
.friday...southwest winds to 30 knots becoming west and
increasing to 45 knot gales in the afternoon. rain and snow in
the morning, then snow in the afternoon. waves 7 to 10 feet
building to 15 to 20 feet. waves occasionally around 26 feet. 
.friday night...west gales to 45 knots becoming northwest and
diminishing to 15 to 25 knots overnight. snow in the evening,
then snow showers likely overnight. waves 16 to 21 feet subsiding
to 8 to 11 feet. waves occasionally around 27 feet. 
.saturday...west winds 10 to 15 knots becoming southwest and
increasing to 30 knots. a chance of snow showers during the day,
then rain and snow showers likely saturday night. waves 4 to
7 feet building to 8 to 11 feet. waves occasionally around
14 feet. 
.sunday...west gales to 40 knots becoming northwest and
diminishing to 15 to 25 knots. snow and rain showers likely
during the day, then a chance of snow showers sunday night. waves
11 to 16 feet subsiding to 7 to 10 feet. waves occasionally
around 20 feet. 
.monday...northwest winds 15 to 20 knots becoming south. a chance
of snow monday night. waves 3 to 6 feet subsiding to 2 to 4 feet.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est wed dec 17 2025


slz022-181000-
saint lawrence river from cape vincent to ogdensburg-
1002 pm est wed dec 17 2025

.overnight...southwest winds 10 knots or less becoming
south. mainly clear, then becoming partly cloudy. 
.thursday...south winds 5 to 15 knots increasing to 15 to
20 knots. partly to mostly sunny. 
.thursday night...south winds 15 to 25 knots. showers.
.friday...southwest winds 15 to 25 knots. rain and snow. 
.friday night...west winds 15 to 25 knots diminishing to 5 to
10 knots overnight. snow likely in the evening, then a chance of
snow showers overnight. 
.saturday...southwest winds 5 to 15 knots increasing to 15 to
20 knots. a chance of snow showers during the day, then snow and
rain showers likely saturday night. 
.sunday...west winds 5 to 15 knots becoming northwest. snow
showers likely during the day, then a chance of snow showers
sunday night. 
.monday...northwest winds 10 knots or less becoming south. a
chance of snow monday night. 

$$