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open lake forecast for lake ontario
national weather service buffalo ny
420 am edt thu apr 30 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 move quebec today while 
a 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 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>065-301515-
lake ontario open waters from hamlin beach to the saint lawrence
river-
420 am edt thu apr 30 2026

.today...west winds 10 to 15 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 
.friday night...west winds 5 to 10 knots. waves 1 to 2 feet. 
.saturday...west winds 5 to 15 knots. waves 1 to 2 feet. 
.sunday...west winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of rain showers sunday night. waves 1 to
3 feet building to 2 to 4 feet. 
.monday...south winds 15 to 20 knots becoming southwest. showers
likely. waves 2 to 4 feet building to 3 to 5 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt thu apr 30 2026


slz022-024-301500-
saint lawrence river from cape vincent to saint regis
403 am edt thu apr 30 2026

.today...northwest winds 5 to 10 knots becoming west. patchy fog
early. showers likely early. 
.tonight...northwest winds 10 knots or less. partly to mostly
cloudy. 
.friday...northwest winds 10 knots or less becoming west. mostly
sunny. 
.friday night...southwest winds 10 knots or less. partly to
mostly cloudy. 
.saturday...west winds 10 knots or less. a chance of rain showers
during the day. 
.sunday...west winds 5 to 10 knots becoming southwest. a chance
of rain showers sunday night. 
.monday...southwest winds 10 to 15 knots. showers likely. 

$$