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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu jun 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...a weak 29.9 inch low over central wisconsin will move to 
southern quebec today through friday before passing across the 
canadian maritimes saturday. a 30.1 inch high will then build across 
the lower great lakes saturday, expanding to the lower great lakes 
sunday and then to the northeast monday.


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

.today...south winds 10 knots or less becoming southeast. a
chance of showers this morning, then showers early this
afternoon. showers likely with a chance of thunderstorms late.
waves 1 foot or less. 
.tonight...southeast winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms in the evening, then a
chance of showers after midnight. waves 1 foot or less. 
.friday...southwest winds 5 to 10 knots becoming west. a chance
of showers in the morning. waves 2 feet or less. 
.friday night...west winds 10 knots or less becoming southwest.
waves 2 feet or less. 
.saturday...northeast winds less than 10 knots becoming north.
waves 1 foot or less. 
.sunday...north winds less than 10 knots. waves 1 foot or less. 
.monday...light and variable winds. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt thu jun 25 2026


slz022-024-251500-
saint lawrence river from cape vincent to saint regis
402 am edt thu jun 25 2026

.today...southwest winds less than 10 knots becoming south.
showers likely with a chance of thunderstorms this afternoon. 
.tonight...southeast winds less than 10 knots. a chance of
showers and thunderstorms early, then showers with a chance of
thunderstorms. showers likely late. 
.friday...south winds 10 knots or less becoming west. showers
likely in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.friday night...southwest winds less than 10 knots. showers with
a chance of thunderstorms in the evening. 
.saturday...light and variable winds. becoming mainly clear. 
.sunday...light and variable winds. mainly clear, then becoming
partly cloudy. 
.monday...light and variable winds. partly to mostly cloudy. 

winds and waves higher in and near thunderstorms.

$$