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open lake forecast for lake ontario
national weather service buffalo ny
1001 pm 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 lake huron this evening will 
move to southern quebec through friday before passing across the 
canadian maritimes saturday. a 30.1 inch high will then build across 
the upper great lakes saturday, the lower great lakes sunday, and 
then southern quebec to new england by monday.


loz063>065-260900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 pm edt thu jun 25 2026

.overnight...southeast winds 5 to 10 knots becoming south.
a chance of showers. waves 1 to 3 feet. 
.friday...southwest winds 5 to 10 knots becoming west. patchy fog
late in the morning. waves 1 to 3 feet. 
.friday night...west winds 5 to 10 knots becoming light and
variable. waves 1 foot or less. 
.saturday...light and variable winds. waves 1 foot or less. 
.saturday night...north winds less than 10 knots becoming
northwest. waves 1 foot or less. 
.sunday...northwest winds less than 10 knots. waves 1 foot or
less. 
.monday...light and variable winds. waves 1 foot or less. 
.tuesday...south winds 10 knots or less. a chance of showers
tuesday night. 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
1001 pm edt thu jun 25 2026


slz022-024-260900-
saint lawrence river from cape vincent to saint regis
1001 pm edt thu jun 25 2026

.overnight...light and variable winds. showers with a
chance of thunderstorms, then showers likely late. 
.friday...light and variable winds becoming west 5 to 10 knots.
showers likely early, then a chance of showers late in the
morning. showers likely in the afternoon. 
.friday night...west winds less than 10 knots. a chance of
showers in the evening. 
.saturday...light and variable winds. partly to mostly sunny. 
.saturday night...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. 
.tuesday...light and variable winds. a chance of showers. 

winds and waves higher in and near thunderstorms.

$$