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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt fri may 1 2026


slz022-024-011500-
saint lawrence river from cape vincent to saint regis
403 am edt fri may 1 2026

.today...northwest winds 10 knots or less becoming west. mostly
sunny. 
.tonight...west winds 10 knots or less becoming southwest. a
chance of rain showers after midnight. 
.saturday...west winds 10 knots or less. a chance of rain
showers. 
.saturday night...west winds 10 knots or less. a chance of rain
showers in the evening. 
.sunday...west winds 5 to 10 knots becoming southwest. partly to
mostly cloudy. 
.monday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. a chance of showers. 
.tuesday...southwest winds 15 to 20 knots becoming south 5 to
15 knots. showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri may 1 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 29.7 inch low across atlantic canada will retrograde 
northwestward across the canadian maritimes and quebec through 
saturday. another 29.7 inch low will deepen to 29.2 inches as it 
tracks from the southeastern states northeast off the atlantic coast 
saturday and sunday, while a 30.2 inch high ridges across the lower 
great lakes. a 29.1 inch low will spin over ontario, quebec, and 
hudson bay monday through tuesday night, sending an attendant cold 
front across the lake tuesday.


loz063>065-011500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt fri may 1 2026

.today...northeast winds 5 to 10 knots becoming north. a chance
of rain showers late. waves 2 feet or less. 
.tonight...southwest winds 5 to 15 knots becoming west. a chance
of showers in the evening. waves 2 feet or less. 
.saturday...west winds 5 to 15 knots. waves 1 to 2 feet. 
.saturday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.sunday...west winds 5 to 15 knots becoming southwest. a chance
of rain showers sunday night. waves 1 to 3 feet. 
.monday...south winds 15 to 25 knots. a chance of showers. waves
2 to 4 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.tuesday...southwest winds 15 to 25 knots becoming south and
diminishing to 10 to 15 knots. showers likely. waves 4 to 7 feet
subsiding to 1 to 2 feet. waves occasionally around 9 feet. 

$$