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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sun sep 20 2026


slz022-024-210900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sun sep 20 2026

.overnight...north winds less than 10 knots increasing to
10 to 15 knots. partly to mostly cloudy. 
.monday...north winds 5 to 15 knots becoming northeast. partly
sunny in the morning, then becoming mostly cloudy. 
.monday night...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. mainly clear. 
.thursday...northeast winds 10 knots or less. partly cloudy. 
.friday...northeast winds 10 knots or less becoming north. partly
cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm 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...
a 30.4 inch high will ridge southeastward across the lake from 
ontario province tonight. this high will then remain ridged across 
the lakes while strengthening to 30.7 inches as it slowly drifts 
east into quebec through midweek, where it will remain through 
thursday. the high will then weaken to 30.3 inches while getting 
shoved back westward into ontario province on friday in response to 
a 29.3 inch low moving northward just off the mid-atlantic and 
jersey coastline.


loz062-210900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt sun sep 20 2026

.overnight...northeast winds 15 to 25 knots. waves 1 to
3 feet building to 5 to 7 feet. waves occasionally around 9 feet.
.monday...northeast winds 15 to 25 knots. waves 3 to 6 feet. 
.monday night...northeast winds 15 to 25 knots. waves 3 to 6 feet
building to 5 to 7 feet. waves occasionally around 9 feet. 
.tuesday...northeast winds 20 to 25 knots becoming east. waves
5 to 8 feet. waves occasionally around 10 feet. 
.tuesday night...east winds 15 to 25 knots. waves 5 to 8 feet.
waves occasionally around 10 feet. 
.wednesday...east winds 15 to 25 knots. waves 3 to 6 feet. 
.thursday...east winds 10 to 15 knots becoming northeast. waves
2 to 4 feet. 
.friday...northeast winds 5 to 15 knots. waves 2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm 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...
a 30.4 inch high will ridge southeastward across the lake from 
ontario province tonight. this high will then remain ridged across 
the lakes while strengthening to 30.7 inches as it slowly drifts 
east into quebec through midweek, where it will remain through 
thursday. the high will then weaken to 30.3 inches while getting 
shoved back westward into ontario province on friday in response to 
a 29.3 inch low moving northward just off the mid-atlantic and 
jersey coastline.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sun sep 20 2026

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

$$