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


slz022-024-120300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu jun 11 2026

.tonight...southwest winds 10 knots or less. a chance of showers
and thunderstorms early, then a chance of showers late this
evening. 
.friday...south winds 5 to 10 knots. a chance of showers and
thunderstorms in the afternoon. 
.friday night...south winds 5 to 15 knots becoming southwest less
than 10 knots. mainly clear. 
.saturday...southwest winds 10 knots or less. sunny.
.saturday night...southwest winds 5 to 10 knots. partly cloudy. 
.sunday...southwest winds 5 to 15 knots. showers with a chance of
thunderstorms. 
.monday...west winds 5 to 15 knots becoming southwest less than
10 knots. partly cloudy. 
.tuesday...southwest winds 10 knots or less. 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 pm 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 will cross 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. a trough averaging 29.8 inches will cross 
the lake on tuesday.


loz062-120300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt thu jun 11 2026

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

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 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 will cross 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. a trough averaging 29.8 inches will cross 
the lake on tuesday.


loz063>065-120300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu jun 11 2026

.tonight...southwest winds 5 to 10 knots. a chance of showers
early. waves 1 foot or less. 
.friday...south winds 5 to 15 knots increasing to 15 to 20 knots.
showers likely with a chance of thunderstorms late in the
morning. a chance of showers and thunderstorms early in the
afternoon. waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...south winds 15 to 20 knots becoming west 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.saturday night...southwest winds 5 to 15 knots becoming south.
waves 2 feet or less. 
.sunday...south winds 10 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. 
.monday...west winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...southwest winds 5 to 10 knots becoming south. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$