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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sat may 16 2026


slz022-024-170900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sat may 16 2026

.overnight...southwest winds 5 to 10 knots. patchy fog
late. 
.sunday...southwest winds 5 to 10 knots becoming northwest.
patchy fog early. 
.sunday night...north winds less than 10 knots. partly to mostly
cloudy. 
.monday...east winds 10 knots or less becoming southwest.
becoming mostly sunny. 
.monday night...southwest winds 5 to 10 knots. a chance of
showers overnight. 
.tuesday...southwest winds 10 to 15 knots. a chance of showers. 
.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. partly to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat may 16 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 central plains on sunday will 
weaken to 29.7 inches as it moves northeast into the upper great 
lakes sunday night 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 near the southern tip of james bay on 
tuesday. a cold front from this low will cross the lake wednesday. a 
30.4 inch high will build across the great lakes wednesday night 
through thursday.


loz063>065-170900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat may 16 2026

.overnight...southwest winds 5 to 15 knots becoming west.
patchy fog. waves 1 to 3 feet. 
.sunday...west winds 5 to 10 knots becoming southwest. patchy fog
in the morning. waves 2 feet or less. 
.sunday night...southeast winds 10 knots or less becoming east. a
chance of showers overnight. waves 1 foot or less. 
.monday...southeast winds 5 to 15 knots becoming south. a chance
of showers in the morning. waves 2 feet or less. 
.monday night...south winds 5 to 15 knots becoming southwest. a
chance of showers. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers and thunderstorms. waves 1 to
3 feet building to 3 to 5 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest. a
chance of showers during the day. waves 3 to 5 feet. 
.thursday...northwest winds 5 to 15 knots becoming north less
than 10 knots. waves 2 to 4 feet subsiding to 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$