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


slz022-024-160300-
saint lawrence river from cape vincent to saint regis
403 pm edt mon jun 15 2026

.tonight...southwest winds 5 to 15 knots diminishing to less than
10 knots. partly cloudy. 
.tuesday...southwest winds 5 to 10 knots. 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 in the
morning, then showers likely with a chance of thunderstorms in
the afternoon. 
.wednesday night...south winds 10 knots or less becoming
southeast. showers likely with a chance of thunderstorms in the
evening, then showers likely overnight. 
.thursday...south winds 15 to 25 knots becoming southwest and
diminishing to 10 to 15 knots. showers with a chance of
thunderstorms. 
.friday...southwest winds 10 to 15 knots becoming west. a chance
of showers and thunderstorms. 
.saturday...west winds 5 to 15 knots. showers likely. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 over the region 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>065-160300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon jun 15 2026

.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 southwest. a
chance of showers. waves 2 feet or less. 
.wednesday night...south winds 5 to 15 knots becoming southeast
and increasing to 15 to 25 knots. a chance of showers in the
evening, then showers overnight. waves 2 feet or less building to
2 to 4 feet. 
.thursday...south winds to 30 knots becoming west. showers with a
chance of thunderstorms during the day, then a chance of showers
and thunderstorms thursday night. waves 6 to 10 feet. waves
occasionally around 13 feet. 
.friday...west winds 15 to 25 knots. waves 5 to 9 feet subsiding
to 4 to 7 feet. waves occasionally around 11 feet. 
.saturday...west winds 15 to 25 knots. waves 5 to 8 feet
subsiding to 3 to 5 feet. waves occasionally around 10 feet. 

winds and waves higher in and near thunderstorms.

$$