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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm 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>065-170900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue sep 16 2025

.overnight...east winds 10 knots or less becoming
southeast. waves 1 foot or less. 
.wednesday...south winds 5 to 10 knots becoming east. waves
2 feet or less. 
.wednesday night...east winds less than 10 knots becoming
southwest. waves 1 foot or less. 
.thursday...southwest winds 10 knots or less becoming west. waves
1 foot or less. 
.thursday night...west winds 5 to 15 knots becoming north 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.friday...north winds 15 to 20 knots becoming northeast. waves
2 to 4 feet. 
.saturday...east winds 15 to 20 knots becoming southeast. waves
2 to 4 feet. 
.sunday...south winds 15 to 20 knots. waves 2 to 4 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt tue sep 16 2025


slz022-024-170900-
saint lawrence river from cape vincent to saint regis
1002 pm edt tue sep 16 2025

.overnight...northeast winds less than 10 knots. patchy fog
after midnight. 
.wednesday...light and variable winds. patchy fog early. 
.wednesday night...southwest winds less than 10 knots. mostly
cloudy. 
.thursday...southwest winds 10 knots or less becoming west.
mostly sunny. 
.thursday night...west winds 10 knots or less becoming north. a
chance of showers. 
.friday...north winds 10 knots or less. mainly clear. 
.saturday...northeast winds 10 knots or less becoming southeast.
mainly clear. 
.sunday...south winds 5 to 10 knots. partly to mostly cloudy. 

$$