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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
410 pm edt thu mar 26 2026


slz022-024-270300-
saint lawrence river from cape vincent to saint regis
410 pm edt thu mar 26 2026

.tonight...northwest winds 10 knots or less becoming north 10 to
15 knots. rain early, then rain and snow showers likely late this
evening. a chance of snow and rain showers after midnight. 
.friday...north winds 5 to 15 knots. sunny.
.friday night...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 showers
during the day. 
.monday...southwest winds 5 to 10 knots becoming north. a chance
of rain and snow showers monday night. 
.tuesday...northeast winds 5 to 10 knots becoming east. a chance
of rain and snow showers during the day, then rain and snow
showers likely tuesday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt thu mar 26 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 trailing cold front will move south 
across the lake this evening. a strong 30.6 inch high will 
then 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.


loz062-270300-
lake ontario open waters from the niagara river to hamlin beach-
409 pm edt thu mar 26 2026

.tonight...north winds 5 to 15 knots increasing to 15 to
20 knots. rain this evening, then a chance of rain showers after
midnight. waves 1 to 2 feet building to 3 to 5 feet. 
.friday...north winds 15 to 20 knots diminishing to 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday night...northwest winds 10 to 15 knots. 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
2 to 4 feet. 
.saturday night...west winds 15 to 20 knots becoming southwest
10 to 15 knots. waves 2 to 4 feet. 
.sunday...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots becoming northeast 15 to
20 knots. a chance of rain showers monday night. waves 2 to
3 feet. 
.tuesday...east winds 15 to 25 knots. a chance of rain showers
during the day, then rain showers likely tuesday night. waves
3 to 6 feet building to 5 to 8 feet. waves occasionally around
10 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt thu mar 26 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 trailing cold front will move south 
across the lake this evening. a strong 30.6 inch high will 
then 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.


loz063-064-270300-
lake ontario open waters from hamlin beach to mexico bay-
409 pm edt thu mar 26 2026

.tonight...northeast winds less than 10 knots becoming north and
increasing to 15 to 25 knots after midnight. rain this evening,
then a chance of rain and snow showers after midnight. waves 1 to
2 feet building to 3 to 6 feet. 
.friday...north winds 15 to 25 knots diminishing to 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.friday night...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 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...southwest winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots becoming northeast 15 to
20 knots. a chance of rain showers monday night. waves 1 to
3 feet building to 2 to 4 feet. 
.tuesday...northeast winds 15 to 25 knots becoming east. a chance
of rain showers during the day, then rain showers likely tuesday
night. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt thu mar 26 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 trailing cold front will move south 
across the lake this evening. a strong 30.6 inch high will 
then 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.


loz065-270300-
lake ontario open waters from mexico bay to the saint lawrence
river-
409 pm edt thu mar 26 2026

.tonight...northeast winds 10 knots or less becoming north and
increasing to 15 to 25 knots after midnight. rain this evening,
then a chance of rain and snow showers after midnight. waves 1 to
3 feet building to 3 to 5 feet. 
.friday...north winds 15 to 25 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday night...north winds 10 to 15 knots. waves 2 feet or less.
.saturday...north winds 5 to 15 knots becoming west 15 to
20 knots. waves 2 feet or less building to 2 to 4 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 5 to 15 knots. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.monday...south winds 10 to 15 knots becoming northeast 15 to
20 knots. a chance of rain showers monday night. waves 1 to
3 feet. 
.tuesday...northeast winds 15 to 25 knots becoming east. a chance
of rain showers during the day, then rain showers likely tuesday
night. waves 1 to 3 feet building to 3 to 5 feet. 

$$