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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt sun sep 20 2026


slz022-024-201500-
saint lawrence river from cape vincent to saint regis
403 am edt sun sep 20 2026

.today...northeast winds 10 knots or less. showers likely early,
then a chance of showers. 
.tonight...northeast winds 10 knots or less becoming north 10 to
15 knots. partly to mostly cloudy. 
.monday...north winds 5 to 15 knots becoming northeast. partly
sunny. 
.monday night...northeast winds 5 to 15 knots. mostly cloudy. 
.tuesday...northeast winds 5 to 15 knots. partly cloudy. 
.wednesday...northeast winds 10 knots or less. partly cloudy. 
.thursday...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 sun sep 20 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 29.9 inch inverted trough draped from the ohio valley to new york 
state will drift southeastward and away from the lake this afternoon 
and tonight as a 30.4 inch high builds southeastward across ontario 
province. this high will then strengthen to 30.6 inches as it slowly 
drifts across quebec through thursday.


loz063>065-201500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun sep 20 2026

.today...east winds 5 to 15 knots becoming northeast. showers
likely this morning. waves 1 to 3 feet. 
.tonight...northeast winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 3 to 6 feet. 
.monday...northeast winds 15 to 25 knots. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.monday night...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 6 feet. 
.tuesday...east winds 15 to 20 knots. waves 3 to 6 feet. 
.wednesday...east winds 15 to 20 knots. waves 3 to 5 feet. 
.thursday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 

$$