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


slz022-024-211500-
saint lawrence river from cape vincent to saint regis
403 am edt mon sep 21 2026

.today...north winds 5 to 15 knots becoming northeast. 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
402 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>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon sep 21 2026

.today...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. 

$$