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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon jun 15 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 29.9 inch high will build across the region today, 
then will exit off to our east tuesday. a 29.4 inch low will then 
track north of the lake on wednesday, with its trailing cold front 
approaching the lake late in the day on wednesday. a second 29.4 
inch surface low will then track from the upper great lakes to 
southern quebec wednesday night and thursday, while pushing its warm 
front across the lake later wednesday night and early thursday, 
followed by its trailing cold front later thursday. the low will 
then make its way to the canadian maritimes friday, while a 29.9 
inch high builds across the upper great lakes.


loz063>065-151500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon jun 15 2026

.today...west winds 15 to 20 knots. waves 3 to 6 feet. 
.tonight...west winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...southwest winds 5 to 15 knots becoming south. waves
2 feet or less. 
.tuesday night...south winds 5 to 15 knots. a chance of showers
overnight. waves 2 feet or less. 
.wednesday...south winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers during the day, then showers likely
with a chance of thunderstorms wednesday night. waves 1 to
3 feet. 
.thursday...south winds to 30 knots becoming west and diminishing
to 15 to 20 knots. showers with a chance of thunderstorms during
the day, then a chance of showers thursday night. waves 5 to
8 feet. waves occasionally around 10 feet. 
.friday...west winds 15 to 25 knots. waves 4 to 7 feet subsiding
to 3 to 6 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt mon jun 15 2026


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saint lawrence river from cape vincent to saint regis
402 am edt mon jun 15 2026

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

winds and waves higher in and near thunderstorms.

$$