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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt thu jun 11 2026


slz022-024-111500-
saint lawrence river from cape vincent to saint regis
402 am edt thu jun 11 2026

.today...southwest winds 5 to 10 knots. a chance of showers late
this morning. a chance of showers and thunderstorms early this
afternoon, then showers likely with a chance of thunderstorms
late. 
.tonight...southwest winds 10 knots or less. a chance of showers
and thunderstorms early. 
.friday...south winds 5 to 10 knots becoming southwest. a chance
of showers in the morning, then showers likely with a chance of
thunderstorms in the afternoon. 
.friday night...southwest winds 5 to 15 knots diminishing to less
than 10 knots. showers likely in the evening. 
.saturday...southwest winds 5 to 10 knots. a chance of showers
saturday night. 
.sunday...southwest winds 5 to 15 knots. showers with a chance of
thunderstorms. 
.monday...southwest winds 5 to 15 knots diminishing to less than
10 knots. partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu jun 11 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 warm front will cross the lake tonight ahead of a 29.7 
inch trough that will cross the lake later friday. associated with 
the trough, an attendant cold front across the lake friday afternoon 
and evening. a 30.0 inch high will ridge across the lower great 
lakes friday night through sunday morning, before a cold front 
crosses the region later sunday or sunday night. the eastern edge of 
a 30.1 inch high over the central portion of the conus will push 
over the lake on monday.


loz063>065-111500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu jun 11 2026

.today...southwest winds 5 to 15 knots becoming southeast. a
chance of showers early. waves 2 feet or less. 
.tonight...southwest winds 5 to 10 knots. waves 1 foot or less. 
.friday...south winds 5 to 15 knots becoming west 15 to 20 knots.
showers with a chance of thunderstorms. waves 1 to 3 feet
building to 2 to 4 feet. 
.friday night...west winds 15 to 20 knots becoming southwest 5 to
15 knots. a chance of showers in the evening. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots becoming south. waves 1 to
2 feet. 
.sunday...south winds 15 to 20 knots becoming west 10 to
15 knots. showers with a chance of thunderstorms. waves 1 to
3 feet. 
.monday...west winds 5 to 15 knots becoming southwest. waves 1 to
3 feet. 

winds and waves higher in and near thunderstorms.

$$