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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 am edt fri apr 17 2026


slz022-024-171500-
saint lawrence river from cape vincent to saint regis
404 am edt fri apr 17 2026

.today...north winds 10 knots or less becoming northeast. patchy
fog early. 
.tonight...northeast winds less than 10 knots. mainly clear
through the early overnight, 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 west.
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.
mostly cloudy, then clearing. 
.tuesday...south winds 5 to 10 knots becoming southwest. a chance
of rain showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt fri apr 17 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 30.0 inch high will build across the lower great lakes 
today, and new england tonight. 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. a 29.9 
inch trough will move across the lake tuesday night before a 30.1 
inch high moves across the great lakes region wednesday.


loz062-171500-
lake ontario open waters from the niagara river to hamlin beach-
404 am edt fri apr 17 2026

.today...northwest winds 10 knots or less becoming east. areas of
fog through early afternoon. waves 1 foot or less. 
.tonight...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...southeast winds 10 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...west winds 15 to 20 knots becoming northwest.
rain showers in the evening, then rain showers likely overnight.
waves 3 to 5 feet. 
.sunday...west winds 15 to 20 knots becoming northwest. a chance
of rain showers. waves 3 to 5 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am edt fri apr 17 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 30.0 inch high will build across the lower great lakes 
today, and new england tonight. 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. a 29.9 
inch trough will move across the lake tuesday night before a 30.1 
inch high moves across the great lakes region wednesday.


loz063>065-171500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
404 am edt fri apr 17 2026

.today...north winds 5 to 10 knots becoming northwest. areas of
fog through early afternoon. waves 2 feet or less. 
.tonight...west winds 10 knots or less becoming southeast 10 to
15 knots. waves 1 foot or less. 
.saturday...southeast winds 15 to 20 knots becoming south.
showers in the afternoon. waves 1 to 3 feet building to 3 to
5 feet. 
.saturday night...south winds 15 to 20 knots becoming west. rain
showers. waves 3 to 5 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. rain
showers during the day. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.monday...northwest winds 15 to 20 knots becoming west. waves
3 to 6 feet subsiding to 2 to 4 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. a
chance of rain showers tuesday night. waves 1 to 3 feet building
to 2 to 4 feet. 

$$