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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt wed apr 29 2026


slz022-024-291500-
saint lawrence river from cape vincent to saint regis
403 am edt wed apr 29 2026

.today...southwest winds less than 10 knots becoming north. a
chance of showers early this afternoon. rain late. 
.tonight...north winds 10 knots or less becoming west. rain.
.thursday...west winds 5 to 10 knots. rain showers likely in the
morning, then a chance of rain showers in the afternoon. 
.thursday night...west winds 10 knots or less. partly to mostly
cloudy. 
.friday...west winds 5 to 10 knots becoming southwest. a chance
of rain showers. 
.saturday...southwest winds 10 knots or less. a chance of rain
showers. 
.sunday...southwest winds 5 to 15 knots. a chance of rain
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed apr 29 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...an elongated 29.9 inch low over the upper ohio valley 
will deepen to 29.7 inches as it tracks to near watertown by early 
this evening. this low will then lift out across quebec tonight and 
thursday while another 29.6 inch low develops and tracks northeast 
off the mid-atlantic and new england coastlines. this second low 
will then retrograde northward and then northwestward across the 
canadian maritimes and quebec respectively friday and saturday. a 
third 29.5 inch low will then track from the southeastern states 
northeastward into the western atlantic saturday through sunday... 
while a 29.8 inch high ridges across the lower great lakes.


loz062-291500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt wed apr 29 2026

.today...north winds 5 to 15 knots. rain this afternoon. waves
2 feet or less. 
.tonight...northwest winds 10 to 15 knots becoming west 15 to
20 knots. rain in the evening, then a chance of showers after
midnight. waves 2 to 4 feet. 
.thursday...west winds 15 to 20 knots. waves 2 to 4 feet. 
.thursday night...northwest winds 15 to 20 knots becoming west
10 to 15 knots. waves 2 to 4 feet. 
.friday...west winds 10 to 15 knots. waves 2 to 4 feet. 
.saturday...west winds 10 to 15 knots. waves 1 to 3 feet. 
.sunday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed apr 29 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...an elongated 29.9 inch low over the upper ohio valley 
will deepen to 29.7 inches as it tracks to near watertown by early 
this evening. this low will then lift out across quebec tonight and 
thursday while another 29.6 inch low develops and tracks northeast 
off the mid-atlantic and new england coastlines. this second low 
will then retrograde northward and then northwestward across the 
canadian maritimes and quebec respectively friday and saturday. a 
third 29.5 inch low will then track from the southeastern states 
northeastward into the western atlantic saturday through sunday... 
while a 29.8 inch high ridges across the lower great lakes.


loz063>065-291500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed apr 29 2026

.today...east winds 5 to 15 knots becoming north. rain this
afternoon. waves 2 feet or less. 
.tonight...northwest winds 10 to 15 knots becoming west 15 to
20 knots. rain through the early overnight, then a chance of
showers late. waves 2 feet or less building to 3 to 5 feet. 
.thursday...west winds 15 to 25 knots. a chance of rain showers
in the morning. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.thursday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.friday...west winds 10 to 15 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 3 to 6 feet. 
.saturday...west winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.sunday...west winds 10 to 15 knots becoming southwest. waves
1 to 3 feet building to 2 to 4 feet. 

$$