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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue sep 16 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 30.3 inch high across ontario and quebec will drift 
east off the new england coast wednesday into wednesday night, while 
remaining ridged over the lake. a cold front will cross the lake 
thursday night, with another area of high pressure over western 
ontario builds southeast across the lower great lakes friday and 
saturday.


loz063>065-161500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue sep 16 2025

.today...northeast winds 5 to 15 knots. waves 2 feet or less. 
.tonight...northeast winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday...south winds 10 knots or less becoming east. waves
1 foot or less. 
.wednesday night...east winds less than 10 knots becoming
southwest. waves 1 foot or less. 
.thursday...southwest winds 5 to 15 knots becoming north. waves
2 feet or less. 
.friday...north winds 15 to 20 knots becoming northeast. waves
1 to 3 feet building to 2 to 4 feet. 
.saturday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. waves 2 to 4 feet subsiding to 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 tue sep 16 2025


slz022-024-161500-
saint lawrence river from cape vincent to saint regis
402 am edt tue sep 16 2025

.today...northeast winds 10 knots or less. patchy fog early. 
.tonight...northeast winds less than 10 knots. patchy fog after
midnight. 
.wednesday...light and variable winds. patchy fog in the morning.
.wednesday night...southwest winds less than 10 knots. partly
cloudy. 
.thursday...southwest winds 10 knots or less becoming north.
mainly clear, then becoming partly cloudy. 
.friday...north winds 5 to 10 knots becoming northeast. mainly
clear. 
.saturday...northeast winds 10 knots or less becoming southeast.
mainly clear, then becoming partly cloudy. 

$$