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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1011 pm edt thu apr 16 2026


slz022-024-170900-
saint lawrence river from cape vincent to saint regis
1011 pm edt thu apr 16 2026

.overnight...west winds less than 10 knots becoming north.
a chance of showers. patchy fog. 
.friday...north winds less than 10 knots becoming northeast.
mostly cloudy through early afternoon, then becoming partly
sunny. 
.friday night...northeast winds less than 10 knots. mainly clear
in the evening, then becoming partly cloudy. 
.saturday...southeast winds 5 to 15 knots becoming south. a
chance of showers in the afternoon. 
.saturday night...south winds 10 to 15 knots becoming southwest.
showers.
.sunday...west winds 5 to 15 knots becoming northwest. rain
showers during the day, then a chance of rain showers sunday
night. 
.monday...northwest winds 10 knots or less becoming southwest.
partly cloudy, then becoming mainly clear. 
.tuesday...south 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
1010 pm edt thu apr 16 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 29.7 inch low over southern quebec will move to the 
saint lawrence valley this evening, then to the canadian maritimes 
by friday morning...with a 30.0 inch high then building across the 
lower great lakes friday, and new england friday night. a 29.4 inch 
low near lake superior friday evening will move to james bay and 
deepen to 29.0 inches saturday, while pushing a trailing strong cold 
front across the lake later saturday and saturday evening. a 30.4 
inch high will then settle southeastward across the great lakes 
sunday through monday night, before sliding off the mid-atlantic 
coast tuesday.


loz062-170900-
lake ontario open waters from the niagara river to hamlin beach-
1010 pm edt thu apr 16 2026

.overnight...west winds 5 to 10 knots becoming northwest. a
chance of showers. areas of fog. waves 1 to 3 feet. 
.friday...northwest winds 10 knots or less becoming south. patchy
fog early. waves 1 foot or less. 
.friday night...southeast winds 10 knots or less becoming east.
waves 1 foot or less. 
.saturday...southeast winds 5 to 15 knots becoming southwest
15 to 20 knots. a chance of showers in the morning, then showers
in the afternoon. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday night...southwest winds 15 to 20 knots becoming west.
rain showers. waves 2 to 4 feet building to 3 to 5 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. a chance
of rain showers during the day. waves 3 to 6 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 2 feet. 
.tuesday...south winds 15 to 20 knots becoming west. waves 2 to
4 feet building to 3 to 5 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 pm edt thu apr 16 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 29.7 inch low over southern quebec will move to the 
saint lawrence valley this evening, then to the canadian maritimes 
by friday morning...with a 30.0 inch high then building across the 
lower great lakes friday, and new england friday night. a 29.4 inch 
low near lake superior friday evening will move to james bay and 
deepen to 29.0 inches saturday, while pushing a trailing strong cold 
front across the lake later saturday and saturday evening. a 30.4 
inch high will then settle southeastward across the great lakes 
sunday through monday night, before sliding off the mid-atlantic 
coast tuesday.


loz063>065-170900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 pm edt thu apr 16 2026

.overnight...west winds 5 to 10 knots becoming northwest.
areas of fog. a chance of showers. waves 1 to 2 feet. 
.friday...north winds 10 knots or less becoming west. patchy fog
early. a chance of showers early. waves 2 feet or less. 
.friday night...west winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.saturday...southeast winds 10 to 15 knots becoming south 15 to
20 knots. showers likely in the afternoon. waves 1 to 3 feet
building to 2 to 4 feet. 
.saturday night...south winds 15 to 20 knots becoming west. rain
showers. waves 2 to 4 feet building to 3 to 6 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. rain
showers likely with a chance of snow showers during the day, then
a chance of rain and snow showers sunday night. waves 3 to 6 feet
building to 5 to 9 feet. waves occasionally around 11 feet. 
.monday...northwest winds 15 to 25 knots becoming west. waves
5 to 8 feet subsiding to 3 to 6 feet. waves occasionally around
10 feet. 
.tuesday...south winds 15 to 20 knots becoming west. a chance of
rain showers tuesday night. waves 2 to 4 feet building to 3 to
5 feet. 

$$