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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sun may 17 2026


slz022-024-172100-
saint lawrence river from cape vincent to saint regis
1003 am edt sun may 17 2026

.this afternoon...west winds 5 to 10 knots becoming northwest.
becoming mostly sunny. 
.tonight...north winds less than 10 knots. a chance of showers
late. 
.monday...east winds 10 knots or less becoming southwest. a
chance of showers in the morning. 
.monday night...southwest winds 5 to 10 knots. mainly clear in
the evening, then becoming partly cloudy. 
.tuesday...southwest winds 10 to 15 knots. showers likely tuesday
night. 
.wednesday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers during the day. 
.thursday...north winds 5 to 10 knots becoming light and
variable. becoming mainly clear. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun may 17 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 29.4 inch low over the upper mississippi valley today 
will weaken to 29.7 inches as it moves northeast into the upper 
great lakes tonight while swinging an attendant warm front across 
the lake. another area of low pressure will develop over the central 
plains monday. the low will weaken from 29.4 inches to 29.6 inches 
as it tracks northeast to the upper great lakes monday night into 
tuesday morning, then to central quebec wednesday while 
strengthening to 29.4 inches. a cold front attendant to this low 
will cross the lake late tuesday night into wednesday morning. a 
large 30.4 inch high will then build across the entire great lakes 
region wednesday night through thursday.


loz063>065-172100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun may 17 2026

.this afternoon...west winds 10 knots or less becoming south.
patchy fog. waves 2 feet or less. 
.tonight...southeast winds 10 knots or less becoming east. a
chance of showers late. waves 1 foot or less. 
.monday...southeast winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.monday night...south winds 5 to 10 knots becoming southwest.
waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers likely with a chance of thunderstorms tuesday
night. waves 1 to 3 feet building to 3 to 5 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest.
showers likely with a chance of thunderstorms during the day.
waves 3 to 6 feet. 
.thursday...north winds 5 to 15 knots diminishing to less than
10 knots. waves 2 to 4 feet subsiding to 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$