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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est wed nov 12 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 28.2 inch low will slowly advance northwards across 
newfoundland tonight, as a 29.5 inch low crosses the great lakes. 
another 29.2 inch low will develop south of nova scotia thursday, 
then move north across the canadian maritimes friday, remaining in 
place through saturday. meanwhile, a 30.1 inch high will build from 
northwest ontario province friday to james bay and the lower great 
lakes by saturday. a 29.2 inch low will track across the lake and to 
new england through the day on sunday.


loz064-065-130400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est wed nov 12 2025

.tonight...west winds to 30 knots becoming northwest 15 to
25 knots. rain showers. waves 7 to 11 feet subsiding to 6 to
9 feet. waves occasionally around 14 feet. 
.thursday...northwest winds 15 to 25 knots. rain showers through
early afternoon, then a chance of rain showers late. waves 5 to
9 feet. waves occasionally around 11 feet. 
.thursday night...northwest winds 15 to 25 knots diminishing to
10 to 15 knots. rain showers likely. waves 4 to 7 feet subsiding
to 3 to 6 feet. waves occasionally around 9 feet. 
.friday...northwest winds 10 to 15 knots. a chance of rain and
snow showers in the morning, then a chance of rain showers in the
afternoon. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...north winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 
.saturday...southeast winds 5 to 15 knots becoming southwest
15 to 20 knots. a chance of rain during the day, then rain
saturday night. waves 1 to 3 feet building to 3 to 5 feet. 
.sunday...west winds to 30 knots becoming northwest. rain showers
during the day, then rain and snow showers sunday night. waves
6 to 9 feet building to 7 to 11 feet, then subsiding to 6 to
9 feet. waves occasionally around 14 feet. 
.monday...northwest winds to 30 knots diminishing to 15 to
25 knots. rain and snow showers likely during the day, then a
chance of rain showers monday night. waves 6 to 10 feet subsiding
to 3 to 6 feet. waves occasionally around 13 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est wed nov 12 2025


slz022-130400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est wed nov 12 2025

.tonight...west winds 5 to 15 knots. rain showers likely this
evening, then a chance of rain showers, freezing rain and snow
showers after midnight. 
.thursday...west winds 5 to 10 knots. a chance of snow showers,
rain showers and freezing rain early, then a chance of rain and
snow showers late in the morning. a chance of rain showers in the
afternoon. 
.thursday night...west winds 10 knots or less becoming northwest.
a chance of rain and snow showers in the evening, then a chance
of snow and rain showers overnight. 
.friday...northwest winds less than 10 knots. partly to mostly
sunny. 
.friday night...northwest winds less than 10 knots. partly
cloudy. 
.saturday...southwest winds 10 knots or less. a chance of rain
during the day, then rain saturday night. 
.sunday...west winds 5 to 15 knots. rain showers with snow
showers likely. 
.monday...west winds 10 knots or less. a chance of snow showers
during the day. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est wed nov 12 2025


slz024-130400-
saint lawrence river from ogdensburg to saint regis-
402 pm est wed nov 12 2025

.tonight...southwest winds 10 knots or less becoming west. rain
showers this evening, then a chance of snow showers, rain showers
and freezing rain after midnight. 
.thursday...west winds 10 knots or less. snow showers likely in
the morning, then a chance of snow and rain showers in the
afternoon. 
.thursday night...west winds less than 10 knots. a chance of snow
showers. 
.friday...west winds less than 10 knots becoming northwest. a
chance of snow showers. 
.friday night...northwest winds less than 10 knots. partly
cloudy. 
.saturday...west winds 10 knots or less becoming southeast. a
chance of rain and snow during the day, then snow and rain
saturday night. 
.sunday...west winds 5 to 10 knots. snow and rain showers. 
.monday...west winds 5 to 10 knots. a chance of snow showers
during the day. 

$$