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


slz022-024-031500-
saint lawrence river from cape vincent to saint regis
403 am edt sun may 3 2026

.today...west winds 10 knots or less becoming southwest 10 to
15 knots. mostly cloudy early, then becoming mostly sunny. 
.tonight...southwest winds 5 to 15 knots. a chance of showers.
showers likely late. 
.monday...southwest winds 10 to 15 knots. a chance of showers in
the morning. 
.monday night...southwest winds 5 to 15 knots becoming south.
partly to mostly cloudy. 
.tuesday...southwest winds 5 to 15 knots diminishing to less than
10 knots. showers.
.wednesday...west winds 10 knots or less becoming southwest. rain
showers during the day, then a chance of rain showers wednesday
night. 
.thursday...west winds 10 knots or less. a chance of rain
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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.


loz062-031500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sun may 3 2026

.today...west winds 5 to 15 knots becoming southwest 15 to
20 knots. a chance of rain showers late. waves 1 to 3 feet. 
.tonight...southwest winds 15 to 20 knots. a chance of showers in
the evening. waves 2 to 4 feet building to 3 to 6 feet. 
.monday...southwest winds 15 to 20 knots. waves 3 to 5 feet. 
.monday night...southwest winds 15 to 20 knots. a chance of
showers overnight. waves 3 to 5 feet. 
.tuesday...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots. showers. waves 3 to 5 feet subsiding to 1 to
2 feet. 
.wednesday...northwest winds 10 knots or less. showers during the
day. waves 1 foot or less. 
.thursday...northwest winds 10 knots or less becoming west 10 to
15 knots. a chance of showers. waves 2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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>065-031500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun may 3 2026

.today...west winds 5 to 15 knots becoming southwest. waves 1 to
3 feet. 
.tonight...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers. waves 1 to 3 feet building to 3 to
5 feet. 
.monday...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers in the morning. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.monday night...south winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. showers likely with a chance of thunderstorms during
the day, then showers tuesday night. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.wednesday...west winds 5 to 10 knots. showers during the day,
then a chance of showers wednesday night. waves 2 feet or less. 
.thursday...west winds 5 to 15 knots increasing to 15 to
20 knots. a chance of showers. waves 1 to 3 feet building to 2 to
4 feet. 

winds and waves higher in and near thunderstorms.

$$