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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt fri mar 27 2026


slz022-024-271500-
saint lawrence river from cape vincent to saint regis
403 am edt fri mar 27 2026

.today...north winds 5 to 15 knots. sunny.
.tonight...northwest winds 10 knots or less becoming north.
partly to mostly cloudy. 
.saturday...north winds 10 knots or less becoming west. partly to
mostly sunny. 
.saturday night...west winds 5 to 10 knots becoming southwest. a
chance of snow showers overnight. 
.sunday...southwest winds 5 to 15 knots. a chance of snow and
rain showers during the day. 
.monday...southwest winds 5 to 10 knots becoming northeast. a
chance of rain showers monday night. 
.tuesday...northeast winds 5 to 15 knots becoming south. rain
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri mar 27 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 29.6 inch low will move east across quebec tonight 
before reaching the canadian maritimes by friday morning while 
deepening to 29.4 inches. a strong 30.6 inch high will build from 
the northern plains friday afternoon to the ohio valley saturday 
afternoon and then off the mid atlantic coast sunday. a 30.0 inch 
trough will sag southward across eastern canada monday, then move 
across the eastern great lakes monday night.


loz063-064-271500-
lake ontario open waters from hamlin beach to mexico bay-
402 am edt fri mar 27 2026

.today...north winds 15 to 25 knots diminishing to 10 to
15 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.tonight...northwest winds 5 to 15 knots becoming north. waves
1 to 3 feet. 
.saturday...northwest winds 10 to 15 knots becoming west 15 to
20 knots. a chance of snow showers. waves 1 to 3 feet building to
3 to 6 feet. 
.saturday night...west winds 15 to 20 knots becoming southwest
10 to 15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.sunday...south winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming northeast and
increasing to 15 to 20 knots. a chance of rain showers monday
night. waves 1 to 3 feet. 
.tuesday...east winds 15 to 25 knots becoming south. rain showers
likely. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt fri mar 27 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 29.6 inch low will move east across quebec tonight 
before reaching the canadian maritimes by friday morning while 
deepening to 29.4 inches. a strong 30.6 inch high will build from 
the northern plains friday afternoon to the ohio valley saturday 
afternoon and then off the mid atlantic coast sunday. a 30.0 inch 
trough will sag southward across eastern canada monday, then move 
across the eastern great lakes monday night.


loz065-271500-
lake ontario open waters from mexico bay to the saint lawrence
river-
402 am edt fri mar 27 2026

.today...north winds 15 to 25 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tonight...north winds around 10 knots. waves 2 feet or less. 
.saturday...north winds 5 to 10 knots becoming west and
increasing to 15 to 20 knots. waves 1 foot or less building to
3 to 5 feet. 
.saturday night...west winds 15 to 20 knots becoming southwest
10 to 15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.sunday...south winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming northeast and
increasing to 15 to 20 knots. a chance of rain showers monday
night. waves 1 to 3 feet. 
.tuesday...east winds 15 to 25 knots becoming south. rain
showers. waves 1 to 3 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 

$$