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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm edt thu sep 24 2026


slz022-024-250300-
saint lawrence river from cape vincent to saint regis
402 pm edt thu sep 24 2026

.tonight...northeast winds 10 knots or less. patchy fog from late
evening on. 
.friday...north winds 10 knots or less becoming northeast. patchy
fog early. 
.friday night...northeast winds 10 knots or less becoming north.
mainly clear in the evening, then becoming mostly cloudy. 
.saturday...north winds 5 to 15 knots becoming northeast. partly
sunny. 
.saturday night...northeast winds 5 to 15 knots. mostly cloudy. 
.sunday...northeast winds 5 to 15 knots. a chance of showers
sunday night. 
.monday...northeast winds 10 knots or less. a chance of showers
during the day. 
.tuesday...light and variable winds. partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
401 pm edt thu sep 24 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 30.3 inch high will remain centered across 
southern quebec through saturday before drifting to eastern quebec 
and labrador sunday. meanwhile, an elongated 29.6 inch low well 
offshore of the mid atlantic coast friday is forecast to strengthen 
to 29.3 inches as it moves to just off the southern new england 
coast saturday night. this low will gradually fill to 29.6 inches by 
monday as it meanders near the new england coastline, finally 
exiting into the canadian maritimes by wednesday.


loz062-250300-
lake ontario open waters from the niagara river to hamlin beach-
401 pm edt thu sep 24 2026

.tonight...east winds 15 to 20 knots becoming northeast 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northeast winds 10 knots or less becoming north. waves
1 to 2 feet. 
.friday night...northwest winds 5 to 15 knots becoming north.
waves 2 feet or less building to 2 to 3 feet. 
.saturday...north winds 5 to 15 knots. waves 1 to 3 feet. 
.saturday night...north winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.sunday...northeast winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet. 
.monday...northeast winds 10 to 15 knots becoming light and
variable. waves 1 to 3 feet subsiding to 1 foot or less. 
.tuesday...northeast winds 10 knots or less becoming south. waves
1 foot or less. 

$$

fzus61 kbuf 242001
glflo 
expires:202609250300;;994104

open lake forecast for lake ontario
national weather service buffalo ny
401 pm edt thu sep 24 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 30.3 inch high will remain centered across 
southern quebec through saturday before drifting to eastern quebec 
and labrador sunday. meanwhile, an elongated 29.6 inch low well 
offshore of the mid atlantic coast friday is forecast to strengthen 
to 29.3 inches as it moves to just off the southern new england 
coast saturday night. this low will gradually fill to 29.6 inches by 
monday as it meanders near the new england coastline, finally 
exiting into the canadian maritimes by wednesday.


loz063>065-250300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
401 pm edt thu sep 24 2026

.tonight...northeast winds 10 to 15 knots. waves 1 to 3 feet. 
.friday...northeast winds 10 to 15 knots becoming north. waves
1 to 3 feet. 
.friday night...north winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...north winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.saturday night...north winds 15 to 25 knots. waves 3 to 6 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.sunday...northeast winds 15 to 25 knots. a chance of showers
sunday night. waves 4 to 7 feet subsiding to 3 to 6 feet. waves
occasionally around 9 feet. 
.monday...northeast winds 15 to 20 knots becoming north 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...north winds 10 knots or less becoming south. waves
1 foot or less. 

$$