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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt mon aug 31 2026


slz022-024-312100-
saint lawrence river from cape vincent to saint regis
1003 am edt mon aug 31 2026

.this afternoon...southeast winds less than 10 knots becoming
east. a chance of showers late. 
.tonight...east winds 10 knots or less becoming northeast.
showers.
.tuesday...northeast winds 5 to 10 knots. a chance of showers. 
.tuesday night...northeast winds less than 10 knots. a chance of
showers in the evening, then a chance of showers and
thunderstorms overnight. 
.wednesday...southwest winds 5 to 10 knots. showers with a chance
of thunderstorms. 
.thursday...west winds 10 knots or less becoming northwest. a
chance of showers. 
.friday...northwest winds less than 10 knots becoming north. a
chance of showers. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt mon aug 31 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 frontal boundary will remain stalled near the lake 
today through tuesday before moving northeast across the lake 
tuesday night as a warm front. a 29.8 inch low will then move from 
northwest ontario province tuesday night to western quebec by 
wednesday night before reaching northern new england and the 
canadian maritimes thursday night. a trailing cold front will move 
south across the lake thursday.


loz063>065-312100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt mon aug 31 2026

.rest of today...southeast winds 5 to 15 knots. a chance of
showers late this morning, then showers with a chance of
thunderstorms this afternoon. waves 2 feet or less. 
.tonight...southeast winds 10 knots or less becoming south.
showers with a chance of thunderstorms. waves 1 foot or less. 
.tuesday...southwest winds 10 knots or less becoming north.
showers likely in the morning, then a chance of showers in the
afternoon. waves 1 foot or less. 
.tuesday night...east winds 10 knots or less becoming south.
showers likely with a chance of thunderstorms overnight. waves
1 foot or less. 
.wednesday...south winds 5 to 15 knots becoming west. showers
likely with a chance of thunderstorms. waves 1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$