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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon oct 27 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...an expansive 30.5 inch high will remain anchored 
over quebec through wednesday night before slowly weakening. a 
surface low will then approach the lake from the south thursday 
strengthening to 29.4 inches, the low will then cross the lake 
thursday night while continuing to strengthen. the low will then 
track northeast of the lake on friday and to the canadian maritimes 
through saturday, strengthening in the process to 28.6 inches.


loz063>065-280300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon oct 27 2025

.tonight...northeast winds 10 to 15 knots becoming east. waves
1 to 3 feet. 
.tuesday...east winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday night...northeast winds 15 to 20 knots becoming east.
waves 3 to 5 feet. 
.wednesday...northeast winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.wednesday night...northeast winds 10 to 15 knots becoming east.
a chance of showers overnight. waves 1 to 3 feet. 
.thursday...east winds 15 to 25 knots becoming northeast to
30 knots. showers. waves 3 to 6 feet building to 7 to 10 feet.
waves occasionally around 13 feet. 
.friday...northwest winds to 30 knots becoming west and
increasing to 35 knot gales. showers. waves 7 to 10 feet building
to 10 to 15 feet. waves occasionally around 19 feet. 
.saturday...west winds to 30 knots diminishing to 15 to 20 knots.
showers. waves 10 to 14 feet subsiding to 3 to 6 feet. waves
occasionally around 18 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 27 2025


slz022-024-280300-
saint lawrence river from cape vincent to saint regis
402 pm edt mon oct 27 2025

.tonight...northeast winds 10 knots or less. mainly clear through
the early overnight, then becoming partly cloudy. 
.tuesday...northeast winds 10 knots or less. mostly sunny. 
.tuesday night...northeast winds 10 knots or less. mainly clear. 
.wednesday...northeast winds 10 knots or less. sunny.
.wednesday night...northeast winds 10 knots or less. a chance of
rain showers overnight. 
.thursday...northeast winds 5 to 15 knots. rain showers. 
.friday...east winds 5 to 15 knots becoming west. rain showers. 
.saturday...west winds 5 to 15 knots. rain showers during the
day, then a chance of rain showers saturday night. 

$$