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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt mon sep 21 2026


slz022-024-212100-
saint lawrence river from cape vincent to saint regis
1003 am edt mon sep 21 2026

.this afternoon...northeast winds 5 to 10 knots. partly sunny. 
.tonight...northeast winds 5 to 10 knots. partly to 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. mainly clear, then
becoming partly cloudy. 
.friday...northeast winds 5 to 10 knots becoming north. partly
cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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 30.4 inch high over ontario province will build east 
across quebec and strengthen to 30.7 inches through wednesday. the 
high will then slowly retrograde westward to the upper great lakes 
and weaken to 30.4 inches thursday and friday while a 29.3 inch low 
develops and moves northward off the mid-atlantic coastline.


loz062-212100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt mon sep 21 2026

.this afternoon...northeast winds 15 to 20 knots. waves 3 to
5 feet subsiding to 2 to 4 feet. 
.tonight...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 6 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 4 to 7 feet.
waves occasionally around 9 feet. 
.wednesday...east winds 15 to 20 knots. waves 4 to 6 feet
subsiding to 2 to 4 feet. 
.thursday...east winds 10 to 15 knots becoming northeast around
10 knots. waves 2 to 4 feet subsiding to 1 to 2 feet. 
.friday...northeast winds 5 to 15 knots becoming north. waves
2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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 30.4 inch high over ontario province will build east 
across quebec and strengthen to 30.7 inches through wednesday. the 
high will then slowly retrograde westward to the upper great lakes 
and weaken to 30.4 inches thursday and friday while a 29.3 inch low 
develops and moves northward off the mid-atlantic coastline.


loz063>065-212100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt mon sep 21 2026

.this afternoon...northeast winds 15 to 20 knots. waves 3 to
6 feet subsiding to 2 to 4 feet. 
.tonight...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 6 feet. 
.tuesday...northeast winds 15 to 20 knots. waves 3 to 6 feet. 
.tuesday night...northeast winds 15 to 20 knots becoming east.
waves 3 to 6 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
1 to 3 feet. 
.friday...northeast winds 10 to 15 knots becoming north. waves
1 to 3 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
929 am edt mon sep 21 2026

for waters beyond five nautical miles of shore on lake erie

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 trough averaging 30.00 inches will persist across lake erie
through wednesday. high pressure 30.20 inches will build south
across the great lakes thursday into friday.


lez061-169-212015-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
929 am edt mon sep 21 2026

.this afternoon...northeast winds 15 to 25 knots. waves 4 to
7 feet subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.tonight...northeast winds 20 to 25 knots becoming east. waves
4 to 7 feet. waves occasionally around 9 feet. 
.tuesday...east winds 15 to 25 knots becoming northeast. waves
4 to 7 feet. waves occasionally around 9 feet. 
.tuesday night...east winds 15 to 25 knots. a chance of showers
overnight. waves 4 to 7 feet subsiding to 3 to 6 feet. waves
occasionally around 9 feet. 
.wednesday...east winds 15 to 20 knots. a chance of showers
during the day. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.thursday...east winds 10 to 15 knots. waves 1 to 3 feet. 
.friday...northeast winds 5 to 15 knots. waves 2 feet or less. 

$$