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


slz022-024-151500-
saint lawrence river from cape vincent to saint regis
402 am edt wed jul 15 2026

.today...northwest winds 5 to 15 knots becoming west 15 to
20 knots. areas of smoke. 
.tonight...west winds 5 to 10 knots becoming light and variable.
patchy smoke. 
.thursday...west winds 10 knots or less becoming northwest 10 to
15 knots. patchy smoke. 
.thursday night...northwest winds 10 knots or less. patchy smoke
in the evening. 
.friday...northwest winds less than 10 knots becoming south. a
chance of showers friday night. 
.saturday...south winds less than 10 knots becoming northwest.
showers likely with a chance of thunderstorms. 
.sunday...north winds less than 10 knots. mainly clear, then
becoming 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 wed jul 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 cold front will cross the lake late tonight into 
wednesday morning, followed by a secondary cold front pushing south 
across the lake thursday night into friday. a weak 29.8 inch low 
over the upper great lakes friday, will move southeast into the 
lower great lakes on saturday, before deepening to 29.6 inches as it 
passes across new england sunday. meanwhile, a weak 29.9 inch high 
will slide across the great lakes sunday.


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

.today...northwest winds 5 to 15 knots becoming west 15 to
20 knots. areas of smoke. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.tonight...west winds 15 to 20 knots becoming northwest 5 to
15 knots. patchy smoke. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.thursday...west winds 5 to 15 knots increasing to 15 to
20 knots. patchy smoke. waves 1 to 3 feet building to 2 to
4 feet. 
.thursday night...west winds 15 to 20 knots becoming north 5 to
15 knots. patchy smoke in the evening. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.friday...northeast winds 5 to 10 knots becoming southeast. a
chance of showers and thunderstorms friday night. waves 2 feet or
less. 
.saturday...southeast winds 5 to 15 knots becoming north. showers
likely with a chance of thunderstorms. waves 2 feet or less. 
.sunday...north winds 5 to 15 knots becoming southwest. a chance
of showers during the day. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$