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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt sun may 3 2026


slz022-024-040300-
saint lawrence river from cape vincent to saint regis
403 pm edt sun may 3 2026

.tonight...southwest winds 5 to 15 knots. showers likely from
late evening on. 
.monday...southwest winds 10 to 15 knots. a chance of showers
early. 
.monday night...southwest winds 5 to 15 knots becoming south. a
chance of showers overnight. 
.tuesday...southwest winds 10 to 15 knots. a chance of showers in
the morning, then showers in the afternoon. 
.tuesday night...southwest winds 10 knots or less becoming west.
rain.
.wednesday...west winds 10 knots or less becoming southwest. rain
during the day, then a chance of rain showers wednesday night. 
.thursday...west winds 10 knots or less. mostly cloudy. 
.friday...west winds 5 to 15 knots becoming southwest less than
10 knots. a chance of rain showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun may 3 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 29.7 inch low well southeast of maine will deepen to 
28.8 inches as it tracks to atlantic canada through tonight, while a 
30.2 inch high centered over the tennessee valley slides east and 
off the carolina coast. a 29.1 inch low over western ontario 
province monday will then weaken to 29.3 inches as it moves to 
northern quebec through tuesday, with its trailing wavy cold front 
slowly crossing the lake tuesday, then drifting across new england 
through wednesday.


loz062-040300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt sun may 3 2026

.tonight...southwest winds 15 to 20 knots. showers likely early.
waves 1 to 3 feet building to 3 to 5 feet. 
.monday...southwest winds 15 to 20 knots. waves 2 to 4 feet. 
.monday night...southwest winds 15 to 20 knots. a chance of
showers. waves 2 to 4 feet building to 3 to 5 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west. a chance
of showers in the morning, then showers likely in the afternoon.
waves 3 to 5 feet. 
.tuesday night...northwest winds 5 to 15 knots. rain. waves 1 to
3 feet. 
.wednesday...northwest winds 5 to 10 knots. rain during the day.
waves 1 foot or less. 
.thursday...northwest winds 10 knots or less becoming west 10 to
15 knots. waves 2 feet or less. 
.friday...west winds 5 to 15 knots. waves 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun may 3 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 29.7 inch low well southeast of maine will deepen to 
28.8 inches as it tracks to atlantic canada through tonight, while a 
30.2 inch high centered over the tennessee valley slides east and 
off the carolina coast. a 29.1 inch low over western ontario 
province monday will then weaken to 29.3 inches as it moves to 
northern quebec through tuesday, with its trailing wavy cold front 
slowly crossing the lake tuesday, then drifting across new england 
through wednesday.


loz063>065-040300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun may 3 2026

.tonight...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers this evening. a chance of showers
late. waves 1 to 2 feet building to 3 to 5 feet. 
.monday...southwest winds 15 to 20 knots becoming south 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday night...south winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers overnight. waves 1 to 3 feet
building to 2 to 4 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of showers in the morning, then showers likely
with a chance of thunderstorms in the afternoon. waves 2 to
4 feet. 
.tuesday night...west winds 5 to 15 knots becoming northwest.
rain. waves 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots becoming west. rain
during the day. waves 1 to 2 feet. 
.thursday...west winds 5 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.friday...west winds 15 to 20 knots becoming southwest and
diminishing to 5 to 10 knots. waves 2 to 4 feet building to 3 to
5 feet, then subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$