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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt mon may 4 2026


slz022-024-041500-
saint lawrence river from cape vincent to saint regis
403 am edt mon may 4 2026

.today...southwest winds 10 to 15 knots. a chance of showers
early, then a chance of sprinkles late this morning. 
.tonight...southwest winds 5 to 15 knots becoming south. a chance
of showers after midnight. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers.
.tuesday night...southwest winds 10 knots or less. showers in the
evening, then rain likely overnight. 
.wednesday...west winds less than 10 knots becoming southwest.
rain likely 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. a chance
of rain showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon may 4 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 29.1 inch low over western ontario province today will 
weaken to 29.3 inches as it moves to northern quebec through 
tuesday. its trailing wavy cold front will slowly cross the lake 
tuesday, then will drift across new england wednesday and out to sea 
thursday. a 30.1 inch high over the tennessee and ohio valleys will 
then slide to the mid-atlantic coastline friday.


loz062-041500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt mon may 4 2026

.today...southwest winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.tonight...southwest winds 15 to 20 knots. a chance of showers
from late evening on. waves 2 to 4 feet building to 3 to 5 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. showers likely. waves 3 to 5 feet subsiding to 2 to
3 feet. 
.tuesday night...west winds 5 to 10 knots becoming north. showers
likely in the evening, then rain likely overnight. waves 1 to
3 feet. 
.wednesday...north winds 5 to 15 knots becoming northwest. rain
likely during the day. waves 2 feet or less. 
.thursday...northwest winds 5 to 10 knots becoming west. 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 am edt mon may 4 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 29.1 inch low over western ontario province today will 
weaken to 29.3 inches as it moves to northern quebec through 
tuesday. its trailing wavy cold front will slowly cross the lake 
tuesday, then will drift across new england wednesday and out to sea 
thursday. a 30.1 inch high over the tennessee and ohio valleys will 
then slide to the mid-atlantic coastline friday.


loz063>065-041500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon may 4 2026

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

winds and waves higher in and near thunderstorms.

$$