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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sat sep 13 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 30.2 inch high will settle off the east coast through 
this evening. a weak trough of low pressure averaging 29.9 inches 
will then move into the lower great lakes tonight through sunday. a 
30.3 inch high will slowly shift across quebec and to new england 
monday through tuesday. the high will drift off the east coast 
wednesday.


loz063>065-140300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sat sep 13 2025

.tonight...southeast winds 10 knots or less becoming west. waves
1 foot or less. 
.sunday...west winds 10 knots or less becoming north. waves
1 foot or less. 
.sunday night...north winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.monday...northeast winds 5 to 10 knots. waves 1 foot or less. 
.monday night...northeast winds less than 10 knots becoming east.
waves 1 foot or less. 
.tuesday...east winds less than 10 knots. waves 1 foot or less. 
.wednesday...east winds less than 10 knots becoming southeast.
waves 1 foot or less. 
.thursday...south winds 10 knots or less. waves 1 foot or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm edt sat sep 13 2025


slz022-024-140300-
saint lawrence river from cape vincent to saint regis
402 pm edt sat sep 13 2025

.tonight...southwest winds 10 knots or less. a chance of showers
late. 
.sunday...light and variable winds. partly sunny early, then
becoming mostly sunny. 
.sunday night...north winds less than 10 knots becoming
northeast. mainly clear. 
.monday...northeast winds less than 10 knots becoming north.
sunny.
.monday night...light and variable winds. mainly clear. 
.tuesday...light and variable winds. mainly clear. 
.wednesday...light and variable winds. mainly clear, then
becoming partly cloudy. 
.thursday...south winds less than 10 knots becoming southwest.
partly cloudy. 

$$