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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu oct 2 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 large 30.3 inch high will settle south off the 
southern new england coast friday, then remain anchored near the mid 
atlantic coast saturday through monday. a cold front will then move 
east across the lower great lakes late tuesday through early 
wednesday. another strong 30.5 inch high is then forecast to build 
from the upper great lakes wednesday to southern quebec by thursday.


loz063>065-030300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu oct 2 2025

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

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm edt thu oct 2 2025


slz022-024-030300-
saint lawrence river from cape vincent to saint regis
402 pm edt thu oct 2 2025

.tonight...southwest winds 10 knots or less becoming south 10 to
15 knots. partly cloudy. 
.friday...south winds 5 to 10 knots becoming southwest. sunny.
.friday night...southwest winds 10 knots or less. mainly clear in
the evening, then becoming partly cloudy. 
.saturday...light and variable winds. mostly sunny. 
.saturday night...south winds less than 10 knots. mainly clear. 
.sunday...south winds 10 knots or less. mainly clear. 
.monday...southwest winds 5 to 10 knots. a chance of showers
monday night. 
.tuesday...southwest winds 5 to 10 knots. a chance of showers
during the day, then showers likely tuesday night. 

$$