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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt wed apr 29 2026


slz022-024-300900-
saint lawrence river from cape vincent to saint regis
1003 pm edt wed apr 29 2026

.overnight...north winds 5 to 10 knots becoming west. rain.
.thursday...west winds 5 to 10 knots. rain likely early, then a
chance of showers late in the morning. a chance of showers late. 
.thursday night...northwest winds 10 knots or less. a chance of
rain showers in the evening. 
.friday...northwest winds 5 to 10 knots becoming west. a chance
of rain showers in the afternoon. 
.friday night...southwest winds 10 knots or less. a chance of
rain showers in the evening. 
.saturday...west winds 5 to 15 knots becoming southwest less than
10 knots. a chance of rain showers during the day. 
.sunday...southwest winds 5 to 15 knots. partly to mostly cloudy.
.monday...southwest winds 5 to 10 knots becoming south. rain
showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm 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 will 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.


loz062-300900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt wed apr 29 2026

.rest of tonight...northwest winds 10 to 15 knots becoming west.
a chance of showers late this evening. waves 2 to 3 feet. 
.thursday...west winds 10 to 15 knots increasing to 15 to
20 knots. waves 2 to 4 feet. 
.thursday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...west winds 10 to 15 knots. waves 1 to 2 feet. 
.friday night...west winds around 10 knots. waves 1 to 2 feet. 
.saturday...west winds 10 to 15 knots. waves 1 to 2 feet. 
.sunday...west winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.monday...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. showers likely. waves 2 to 4 feet subsiding to 1 to
3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm 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 will 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>065-300900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt wed apr 29 2026

.rest of tonight...northwest winds 10 to 15 knots becoming west.
rain, then a chance of showers late. waves 1 to 3 feet. 
.thursday...west winds 10 to 15 knots increasing to 15 to
20 knots. waves 2 to 4 feet building to 3 to 5 feet. 
.thursday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday...west winds 10 to 15 knots. waves 1 to 3 feet. 
.friday night...west winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday...west winds 5 to 15 knots. waves 1 to 3 feet. 
.sunday...west winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.monday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers likely. waves 1 to 3 feet. 

$$