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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri sep 19 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 30.4 inch high will build southeast from central 
ontario to new england today through saturday night, then off the 
new england coast sunday. broad low pressure averaging 29.8 inches 
will then push across the upper great lakes and into quebec monday 
and tuesday...while pushing a weak cold frontal boundary into the 
lower lakes region.


loz063>065-191500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri sep 19 2025

.today...north winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 foot or less. 
.tonight...north winds 5 to 15 knots becoming northeast 15 to
20 knots. waves 2 feet or less building to 3 to 5 feet. 
.saturday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.saturday night...northeast winds 10 to 15 knots becoming
southeast 15 to 20 knots. waves 1 to 3 feet building to 2 to
4 feet. 
.sunday...southeast winds 15 to 20 knots becoming south. a chance
of showers sunday night. waves 2 to 4 feet building to 3 to
5 feet. 
.monday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers during the day, then showers likely
monday night. waves 3 to 5 feet subsiding to 1 to 2 feet. 
.tuesday...southwest winds 5 to 10 knots becoming north. showers
likely during the day, then a chance of showers tuesday night.
waves 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt fri sep 19 2025


slz022-024-191500-
saint lawrence river from cape vincent to saint regis
402 am edt fri sep 19 2025

.today...north winds 5 to 10 knots. sunny.
.tonight...north winds 10 knots or less becoming northeast.
mainly clear. 
.saturday...northeast winds 10 knots or less. sunny.
.saturday night...northeast winds less than 10 knots becoming
east. mainly clear in the evening, then becoming partly cloudy. 
.sunday...southeast winds 5 to 10 knots becoming south. a chance
of rain showers sunday night. 
.monday...south winds 10 knots or less becoming southwest. a
chance of showers. 
.tuesday...southwest winds 10 knots or less becoming north. a
chance of showers. 

$$