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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri sep 25 2026


slz022-024-260300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri sep 25 2026

.tonight...northeast winds 10 knots or less becoming north.
mainly clear through the early overnight, then becoming partly
cloudy. 
.saturday...northeast winds 5 to 10 knots. mostly sunny through
early afternoon, then becoming mostly cloudy. 
.saturday night...northeast winds 5 to 15 knots. partly to mostly
cloudy. 
.sunday...northeast winds 10 to 15 knots. a chance of rain in the
afternoon. 
.sunday night...northeast winds 5 to 15 knots. a chance of rain. 
.monday...northeast winds 10 knots or less. a chance of showers
during the day. 
.tuesday...light and variable winds. mostly cloudy, then becoming
partly cloudy. 
.wednesday...south winds 10 knots or less. partly to mostly
cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt fri sep 25 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 persist across 
ontario and southern quebec through saturday before drifting to 
eastern quebec and labrador sunday. meanwhile, low pressure off the 
east coast will deepen to 29.2 inches saturday east of the delmarva. 
this low will move to near the jersey shore and long island saturday 
night through sunday, then meander northeast along the new england 
coast monday through tuesday while gradually filling to 29.8 inches.


loz063>065-260300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri sep 25 2026

.tonight...north winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...northeast winds 15 to 20 knots becoming north. waves
2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to
4 feet. 
.saturday night...north winds 15 to 25 knots becoming northeast.
waves 2 to 4 feet building to 4 to 7 feet. waves occasionally
around 9 feet. 
.sunday...northeast winds to 30 knots diminishing to 15 to
25 knots. a chance of rain in the afternoon. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.sunday night...northeast winds 15 to 20 knots. a chance of rain.
waves 3 to 6 feet. 
.monday...northeast winds 5 to 15 knots becoming north. waves
2 to 4 feet subsiding to 1 foot or less. 
.tuesday...north winds 10 knots or less becoming south. waves
1 foot or less. 
.wednesday...south winds 5 to 15 knots. waves 2 feet or less. 

$$