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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun may 31 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 30.2 inch high will move southward across lake 
erie through tonight. this will allow a back door cold front to clip 
the eastern lake waters through evening, this from a 29.8 inch area 
of low pressure that will push south across southern quebec and new 
england through tonight. this low will then push off the new england 
coastline on monday. another 30.4 inch high centered over hudson bay 
monday night will then build south across the entire great lakes 
region tuesday and wednesday, then into the ohio valley and lower 
great lakes by thursday.


loz063>065-010300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun may 31 2026

.tonight...west winds 15 to 20 knots becoming north 5 to
15 knots. showers likely early, then a chance of showers late
this evening. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.monday...north winds 5 to 10 knots. waves 1 foot or less. 
.monday night...north winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday...west winds 10 knots or less. waves 1 foot or less. 
.tuesday night...west winds 5 to 10 knots. waves 1 foot or less. 
.wednesday...west winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.thursday...west winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.friday...southwest winds 5 to 15 knots becoming west. a chance
of showers friday night. waves 2 feet or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sun may 31 2026


slz022-024-312100-
saint lawrence river from cape vincent to saint regis
1003 am edt sun may 31 2026

.this afternoon...southwest winds 5 to 10 knots becoming
northwest. a chance of showers. 
.tonight...northwest winds 10 knots or less. showers likely
early, then a chance of showers late in the evening. 
.monday...north winds less than 10 knots becoming northeast.
sunny.
.monday night...northeast winds less than 10 knots. mainly clear.
.tuesday...northwest winds less than 10 knots. partly cloudy. 
.wednesday...light and variable winds. mainly clear. 
.thursday...southwest winds 10 knots or less. mainly clear, then
becoming partly cloudy. 

$$