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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt wed sep 23 2026


slz022-024-231500-
saint lawrence river from cape vincent to saint regis
403 am edt wed sep 23 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed sep 23 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 mid atlantic 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>065-231500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed sep 23 2026

.today...east winds 15 to 20 knots becoming northeast. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...northeast winds 15 to 20 knots becoming southeast 5 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.thursday...east winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.thursday night...northeast winds 10 to 15 knots. waves 1 to
3 feet. 
.friday...northeast winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 3 feet. 
.saturday...north winds 15 to 20 knots. waves 2 to 4 feet. 
.sunday...north winds 15 to 20 knots becoming northeast 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 

$$