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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun oct 12 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 29.6 inch low just offshore of the carolinas will move 
north to just offshore of the delmarva by monday. meanwhile, a 30.5 
inch high will remain in place over the canadian maritimes through 
monday. the east coast low will move east into the atlantic tuesday, 
while a ridge of high pressure averaging 30.2 inches building into 
the lower great lakes. a cold front will move south across the lake 
tuesday night. an expansive 30.3 inch high will then build from the 
upper great lakes wednesday to quebec and the lower great lakes by 
thursday.


loz062-130300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt sun oct 12 2025

.tonight...east winds 15 to 20 knots. waves 3 to 5 feet. 
.monday...east winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet. 
.monday night...east winds 5 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.tuesday...north winds 5 to 10 knots becoming west. waves 2 feet
or less. 
.tuesday night...northwest winds 10 to 15 knots becoming north
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...north winds 15 to 20 knots. waves 2 to 4 feet. 
.thursday...north winds 5 to 15 knots. waves 1 to 3 feet. 
.friday...northeast winds 10 knots or less becoming south. a
chance of showers friday night. waves 1 foot or less. 

$$

fzus61 kbuf 122002
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sun oct 12 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 29.6 inch low just offshore of the carolinas will move 
north to just offshore of the delmarva by monday. meanwhile, a 30.5 
inch high will remain in place over the canadian maritimes through 
monday. the east coast low will move east into the atlantic tuesday, 
while a ridge of high pressure averaging 30.2 inches building into 
the lower great lakes. a cold front will move south across the lake 
tuesday night. an expansive 30.3 inch high will then build from the 
upper great lakes wednesday to quebec and the lower great lakes by 
thursday.


loz063>065-130300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sun oct 12 2025

.tonight...east winds 15 to 20 knots. a chance of showers after
midnight. showers likely late. waves 1 to 3 feet building to 2 to
4 feet. 
.monday...east winds 10 to 15 knots. a chance of showers. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.monday night...east winds 5 to 15 knots becoming northeast. a
chance of showers. waves 1 to 3 feet. 
.tuesday...northeast winds 5 to 10 knots becoming west. waves
2 feet or less. 
.tuesday night...west winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 2 feet building to 3 to 6 feet. 
.wednesday...north winds 15 to 25 knots. waves 3 to 6 feet
subsiding to 3 to 5 feet. 
.thursday...north winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday...north winds 5 to 10 knots becoming south. a chance of
showers friday night. waves 2 feet or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm edt sun oct 12 2025


slz022-024-130300-
saint lawrence river from cape vincent to saint regis
402 pm edt sun oct 12 2025

.tonight...east winds 10 knots or less becoming northeast. a
chance of showers late. 
.monday...northeast winds 5 to 10 knots. a chance of showers. 
.monday night...northeast winds 10 knots or less. a chance of
showers. 
.tuesday...northeast winds less than 10 knots becoming west. a
chance of showers in the morning. 
.tuesday night...southwest winds 10 knots or less becoming
northwest. partly to mostly cloudy. 
.wednesday...north winds 5 to 10 knots becoming northwest. partly
cloudy. 
.thursday...north winds 10 knots or less. mainly clear. 
.friday...northwest winds less than 10 knots becoming south. a
chance of rain showers friday night. 

$$