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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon jul 13 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 large 30.2 inch high will slide east to eastern new 
england today, then shift off the coast tonight and tuesday. this 
will allow a warm front to sweep across the lake tuesday, followed 
by a cold front pushing south across the lake on wednesday, trailed 
by a secondary cold front pushing south across the lake thursday 
into friday.


loz063>065-131500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon jul 13 2026

.today...south winds 5 to 15 knots becoming west. waves 2 feet or
less. 
.tonight...southwest winds 5 to 15 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 6 feet. 
.tuesday night...southwest winds 15 to 25 knots becoming west.
waves 4 to 7 feet subsiding to 3 to 6 feet. waves occasionally
around 9 feet. 
.wednesday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.thursday...west winds 15 to 20 knots becoming north 10 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.friday...north winds 5 to 10 knots becoming southwest. 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 am edt mon jul 13 2026


slz022-024-131500-
saint lawrence river from cape vincent to saint regis
402 am edt mon jul 13 2026

.today...southwest winds 5 to 10 knots. mostly sunny. 
.tonight...southwest winds 5 to 10 knots. partly to mostly
cloudy. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. mostly sunny. 
.tuesday night...southwest winds 15 to 20 knots becoming west
5 to 15 knots. showers likely with a chance of thunderstorms. 
.wednesday...northwest winds 10 knots or less becoming west.
mainly clear, then becoming partly cloudy. 
.thursday...west winds 10 knots or less becoming northwest.
partly cloudy. 
.friday...northwest winds less than 10 knots. a chance of showers
friday night. 

winds and waves higher in and near thunderstorms.

$$