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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon oct 13 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 will remain just offshore of the 
delmarva tonight. meanwhile, a 30.5 inch high will remain in place 
over the canadian maritimes. the east coast low will move east into 
the atlantic tuesday, while a ridge of high pressure averaging 30.2 
inches builds 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 thursday through friday.


loz062-140300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt mon oct 13 2025

.tonight...east winds 5 to 15 knots becoming northeast. waves
2 to 4 feet. 
.tuesday...north winds 5 to 15 knots becoming west. waves 1 to
2 feet. 
.tuesday night...northwest winds 15 to 20 knots becoming north.
waves 2 to 4 feet building to 3 to 5 feet. 
.wednesday...north winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.wednesday night...northwest winds 15 to 20 knots becoming north.
waves 2 to 4 feet. 
.thursday...north winds 5 to 15 knots. waves 1 to 3 feet. 
.friday...west winds 10 knots or less becoming south. a chance of
showers friday night. waves 1 foot or less. 
.saturday...south winds 5 to 15 knots becoming southwest. a
chance of showers during the day, then showers likely saturday
night. waves 2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon oct 13 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 will remain just offshore of the 
delmarva tonight. meanwhile, a 30.5 inch high will remain in place 
over the canadian maritimes. the east coast low will move east into 
the atlantic tuesday, while a ridge of high pressure averaging 30.2 
inches builds 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 thursday through friday.


loz063>065-140300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon oct 13 2025

.tonight...east winds 5 to 15 knots becoming northeast. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...northeast winds 5 to 15 knots becoming west. waves
2 feet or less. 
.tuesday night...west winds 15 to 25 knots becoming north. waves
2 to 4 feet building to 4 to 7 feet. waves occasionally around
9 feet. 
.wednesday...north winds 15 to 25 knots. waves 4 to 7 feet
subsiding to 2 to 4 feet. waves occasionally around 9 feet. 
.wednesday night...north winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.thursday...north winds 15 to 20 knots diminishing to 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday...north winds 10 knots or less becoming south. a chance
of showers friday night. waves 1 foot or less. 
.saturday...south winds 10 to 15 knots. a chance of showers
during the day, then showers likely saturday night. waves 1 to
3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm edt mon oct 13 2025


slz022-024-140300-
saint lawrence river from cape vincent to saint regis
402 pm edt mon oct 13 2025

.tonight...northeast winds 10 knots or less. a chance of showers
late this evening. 
.tuesday...light and variable winds. mostly cloudy early, then
becoming mostly sunny. 
.tuesday night...southwest winds 10 knots or less becoming
northwest. partly to mostly cloudy. 
.wednesday...north winds 5 to 10 knots. mostly sunny. 
.wednesday night...northwest winds 5 to 10 knots. mainly clear. 
.thursday...north winds 5 to 10 knots becoming light and
variable. mainly clear. 
.friday...light and variable winds. a chance of rain showers
friday night. 
.saturday...south winds 5 to 10 knots. a chance of showers. 

$$