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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1011 am edt thu apr 9 2026


slz022-024-092100-
saint lawrence river from cape vincent to saint regis
1012 am edt thu apr 9 2026

.this afternoon...south winds 10 to 15 knots increasing to 15 to
20 knots. partly to mostly sunny. 
.tonight...southwest winds 5 to 15 knots. a chance of showers
early. 
.friday...west winds 10 knots or less becoming northwest.
showers.
.friday night...northwest winds less than 10 knots. rain showers
in the evening, then a chance of rain showers overnight. 
.saturday...northwest winds 5 to 10 knots becoming light and
variable. becoming mainly clear. 
.sunday...south winds 10 knots or less increasing to 10 to
15 knots. a chance of rain showers during the day, then rain
showers likely sunday night. 
.monday...southwest winds 5 to 15 knots. showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 am edt thu apr 9 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 30.6 inch high will drift southeast of nova scotia 
today. a 29.5 inch low will move across james bay today to northern 
quebec tonight, with a trailing cold front crossing the lake tonight 
through friday. a 30.5 inch high is then forecast to build into the 
central great lakes saturday, then drift east to new england by 
sunday. the cold front from a 29.4 inch low near james bay will 
approach the lake monday and then stall nearby into tuesday.


loz062-092100-
lake ontario open waters from the niagara river to hamlin beach-
1010 am edt thu apr 9 2026

.this afternoon...south winds 15 to 20 knots becoming southwest. a
chance of showers late. waves 2 to 4 feet building to 3 to
5 feet. 
.tonight...southwest winds 15 to 20 knots becoming north 5 to
15 knots. a chance of rain showers late. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.friday...north winds 5 to 10 knots becoming northwest. rain
showers. waves around 1 foot. 
.friday night...northwest winds around 10 knots. rain showers in
the evening. waves 1 to 2 feet. 
.saturday...northwest winds 10 knots or less becoming southeast.
waves 2 feet or less. 
.sunday...east winds 5 to 10 knots becoming southwest and
increasing to 15 to 25 knots. a chance of rain showers. waves
1 foot or less building to 3 to 6 feet. 
.monday...southwest winds to 30 knots diminishing to 15 to
25 knots. a chance of showers. waves 4 to 7 feet building to 5 to
9 feet, then subsiding to 4 to 6 feet. waves occasionally around
11 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 am edt thu apr 9 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 30.6 inch high will drift southeast of nova scotia 
today. a 29.5 inch low will move across james bay today to northern 
quebec tonight, with a trailing cold front crossing the lake tonight 
through friday. a 30.5 inch high is then forecast to build into the 
central great lakes saturday, then drift east to new england by 
sunday. the cold front from a 29.4 inch low near james bay will 
approach the lake monday and then stall nearby into tuesday.


loz063>065-092100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 am edt thu apr 9 2026

.this afternoon...south winds 15 to 25 knots. a chance of showers
late. waves 3 to 6 feet. 
.tonight...south winds 15 to 20 knots becoming west 10 to
15 knots. a chance of showers in the evening. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.friday...west winds 5 to 10 knots becoming northwest. rain
showers. waves 1 to 2 feet. 
.friday night...northwest winds 5 to 15 knots. rain showers in
the evening, then a chance of rain showers overnight. waves
2 feet or less. 
.saturday...northwest winds 5 to 15 knots becoming south less
than 10 knots. waves 2 feet or less. 
.sunday...southeast winds 5 to 15 knots becoming south and
increasing to 30 knots. a chance of rain showers. waves 2 feet or
less building to 4 to 7 feet. waves occasionally around 9 feet. 
.monday...southwest winds 15 to 25 knots. showers likely. waves
5 to 8 feet subsiding to 3 to 6 feet. waves occasionally around
10 feet. 

$$