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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue nov 11 2025

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 29.0 inch low will linger over eastern quebec today, 
deepening to 28.2 inches at it then slowly advances towards 
newfoundland wednesday. another 29.2 inch low will develop south of 
nova scotia thursday, then move north across the canadian maritimes 
friday, remaining in place through saturday. meanwhile, a 30.1 inch 
high will then build from northwest ontario province friday to james 
bay and the lower great lakes by saturday.


loz063>065-120400-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm est tue nov 11 2025

.tonight...west winds to 30 knots becoming southwest. a chance of
rain showers early, then rain late this evening. rain and snow
after midnight. waves 7 to 11 feet. waves occasionally around
14 feet. 
.wednesday...southwest winds to 30 knots becoming west. rain and
snow early, then rain late in the morning. rain showers in the
afternoon. waves 6 to 10 feet. waves occasionally around 13 feet.
.wednesday night...west winds to 30 knots. rain showers. waves
6 to 10 feet. waves occasionally around 13 feet. 
.thursday...west winds 15 to 25 knots increasing to 30 knots.
rain showers. waves 6 to 10 feet. waves occasionally around
13 feet. 
.thursday night...northwest winds 15 to 25 knots. rain showers.
waves 5 to 9 feet subsiding to 3 to 6 feet. waves occasionally
around 11 feet. 
.friday...northwest winds 15 to 20 knots becoming north 10 to
15 knots. rain showers likely during the day, then a chance of
rain and snow showers friday night. waves 3 to 5 feet subsiding
to 1 to 3 feet. 
.saturday...north winds 5 to 15 knots becoming southeast 15 to
20 knots. rain likely saturday night. waves 1 to 3 feet. 
.sunday...south winds 15 to 25 knots becoming northwest to
30 knots. rain likely during the day, then rain showers likely
sunday night. waves 3 to 5 feet building to 6 to 10 feet. waves
occasionally around 13 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est tue nov 11 2025


slz022-120400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est tue nov 11 2025

.tonight...west winds 5 to 15 knots becoming southwest. snow and
rain after midnight. 
.wednesday...south winds 5 to 15 knots becoming southwest. snow
and rain in the morning, then rain and snow showers in the
afternoon. 
.wednesday night...west winds 5 to 10 knots. rain showers in the
evening, then rain and snow showers overnight. 
.thursday...west winds 5 to 10 knots. rain and snow showers
likely in the morning, then rain showers likely in the afternoon.
.thursday night...west winds 10 knots or less. a chance of rain
and snow showers in the evening, then a chance of snow showers,
rain showers and freezing rain likely overnight. 
.friday...northwest winds 10 knots or less. a chance of rain
showers, snow showers and freezing rain likely during the day. 
.saturday...northwest winds 10 knots or less becoming southeast.
rain likely with a chance of freezing rain saturday night. 
.sunday...southeast winds 5 to 10 knots becoming west. rain
likely with a chance of freezing rain during the day, then rain
and snow showers likely sunday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est tue nov 11 2025


slz024-120400-
saint lawrence river from ogdensburg to saint regis-
402 pm est tue nov 11 2025

.tonight...west winds 5 to 10 knots becoming southwest. a chance
of snow showers after midnight. snow late. 
.wednesday...south winds 5 to 10 knots becoming southwest. snow
in the morning, then rain and snow showers early in the
afternoon. rain showers late. 
.wednesday night...southwest winds less than 10 knots becoming
west. rain and snow showers. 
.thursday...west winds 10 knots or less. snow and rain showers. 
.thursday night...west winds less than 10 knots. a chance of rain
and snow showers in the evening, then a chance of snow showers
overnight. 
.friday...west winds less than 10 knots becoming northwest. a
chance of snow showers during the day. 
.saturday...northwest winds less than 10 knots. a chance of
freezing rain saturday night. 
.sunday...east winds 10 knots or less becoming west. rain likely
with a chance of freezing rain during the day, then rain and snow
showers likely sunday night. 

$$