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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt mon sep 21 2026


slz022-024-220300-
saint lawrence river from cape vincent to saint regis
403 pm edt mon sep 21 2026

.tonight...northeast winds 5 to 10 knots. mostly cloudy. 
.tuesday...northeast winds 5 to 10 knots. sunny.
.tuesday night...northeast winds 5 to 10 knots. mainly clear. 
.wednesday...northeast winds 10 knots or less. sunny.
.wednesday night...northeast winds 10 knots or less. mainly
clear. 
.thursday...northeast winds 10 knots or less. mainly clear, then
becoming partly cloudy. 
.friday...northeast winds 5 to 10 knots becoming north. partly
cloudy. 
.saturday...north winds 5 to 10 knots. partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon sep 21 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...an expansive 30.6 inch high will remain centered from 
eastern ontario province to southern quebec through saturday while 
gradually weakening to 30.3 inches late this week. an elongated 29.6 
inch low well offshore of the east coast friday is forecast to 
strengthen to 29.2 inches as it moves to just off the southern new 
england coast saturday night through sunday.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon sep 21 2026

.tonight...northeast winds 15 to 25 knots. waves 2 to 4 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.tuesday...northeast winds 15 to 25 knots. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.tuesday night...northeast winds 15 to 20 knots becoming east.
waves 3 to 6 feet. 
.wednesday...east winds 15 to 20 knots becoming northeast. waves
3 to 5 feet subsiding to 2 to 4 feet. 
.wednesday night...east winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet. 
.thursday...east winds 10 to 15 knots becoming northeast. waves
1 to 3 feet. 
.friday...northeast winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...north winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 

$$