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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt fri sep 25 2026


slz022-024-251500-
saint lawrence river from cape vincent to saint regis
403 am edt fri sep 25 2026

.today...northeast winds 5 to 10 knots. sunny.
.tonight...northeast winds 10 knots or less. mainly clear early,
then becoming mostly cloudy. 
.saturday...northeast winds 5 to 10 knots. partly sunny in the
morning, then becoming mostly cloudy. 
.saturday night...northeast winds 5 to 15 knots. mostly cloudy. 
.sunday...northeast winds 5 to 15 knots. mostly cloudy. 
.monday...northeast winds 10 knots or less. mostly cloudy. 
.tuesday...light and variable winds. partly to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri sep 25 2026

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...an expansive 30.3 inch high will remain centered across 
southern quebec through saturday before drifting to eastern quebec 
and labrador sunday. meanwhile, an elongated 29.6 inch low well 
offshore of the mid atlantic coast today is forecast to strengthen 
to 29.3 inches as it moves to just off the southern new england 
coast saturday night. this low will gradually fill to 29.6 inches by 
monday as it meanders near the new england coastline, finally 
exiting into the canadian maritimes by wednesday.


loz062-251500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt fri sep 25 2026

.today...northeast winds 5 to 15 knots becoming northwest less
than 10 knots. waves 1 to 2 feet. 
.tonight...northwest winds less than 10 knots becoming northeast
10 to 15 knots. waves 2 feet or less building to 2 to 3 feet. 
.saturday...northeast winds 5 to 15 knots becoming north less
than 10 knots. waves 1 to 3 feet. 
.saturday night...north winds 10 to 15 knots becoming northeast
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.sunday...northeast winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.monday...northeast winds 10 to 15 knots becoming light and
variable. waves 1 to 3 feet subsiding to 1 foot or less. 
.tuesday...light and variable winds becoming southwest 5 to
10 knots. waves 1 foot or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri sep 25 2026

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...an expansive 30.3 inch high will remain centered across 
southern quebec through saturday before drifting to eastern quebec 
and labrador sunday. meanwhile, an elongated 29.6 inch low well 
offshore of the mid atlantic coast today is forecast to strengthen 
to 29.3 inches as it moves to just off the southern new england 
coast saturday night. this low will gradually fill to 29.6 inches by 
monday as it meanders near the new england coastline, finally 
exiting into the canadian maritimes by wednesday.


loz063>065-251500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri sep 25 2026

.today...northeast winds 10 to 15 knots becoming north. waves
1 to 3 feet. 
.tonight...north winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...northeast winds 15 to 20 knots becoming north. waves
2 to 4 feet. 
.saturday night...northeast winds 15 to 25 knots. waves 2 to
4 feet building to 3 to 6 feet. 
.sunday...northeast winds 15 to 25 knots. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.monday...northeast winds 5 to 15 knots becoming north. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...north winds 10 knots or less becoming south. waves
1 foot or less. 

$$