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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt mon jul 13 2026


slz022-024-140300-
saint lawrence river from cape vincent to saint regis
403 pm edt mon jul 13 2026

.tonight...southwest winds 5 to 10 knots. mainly clear this
evening, then becoming 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 and
diminishing to less than 10 knots overnight. a chance of showers
and thunderstorms. 
.wednesday...northwest winds 10 knots or less becoming west.
sunny.
.wednesday night...west winds 10 knots or less. mainly clear in
the evening, then becoming partly cloudy. 
.thursday...west winds 10 knots or less becoming northwest.
partly cloudy. 
.friday...northwest winds less than 10 knots becoming southwest.
mainly clear, then becoming partly cloudy. 
.saturday...southwest winds less than 10 knots becoming north. a
chance of showers and thunderstorms. 

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 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 shift off the new england 
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.


loz062-140300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt mon jul 13 2026

.tonight...southwest winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday...southwest winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.tuesday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.wednesday...northwest winds 5 to 10 knots becoming west. waves
1 to 3 feet subsiding to 1 foot or less. 
.wednesday night...northwest winds 5 to 15 knots becoming west.
waves 1 to 2 feet. 
.thursday...west winds 5 to 15 knots becoming north. waves 1 to
3 feet. 
.friday...north winds 5 to 10 knots. a chance of showers friday
night. waves 1 foot or less. 
.saturday...southeast winds 10 to 15 knots becoming north.
showers likely during the day, then a chance of showers and
thunderstorms saturday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 shift off the new england 
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>065-140300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon jul 13 2026

.tonight...southwest winds 5 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 20 knots becoming west. waves
2 to 4 feet building to 3 to 6 feet. 
.tuesday night...west winds 15 to 20 knots. waves 4 to 7 feet
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.wednesday...northwest winds 5 to 15 knots becoming west. waves
3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots. waves 2 to 4 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. 
.saturday...south winds 5 to 15 knots becoming northeast. a
chance of showers and thunderstorms. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$