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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1216 pm edt thu jul 16 2026


slz022-024-162115-
saint lawrence river from cape vincent to saint regis
1216 pm edt thu jul 16 2026

.this afternoon...west winds 10 to 15 knots becoming northwest
15 to 20 knots. a chance of showers early. smoke.
.tonight...northwest winds 5 to 15 knots. smoke early. 
.friday...northwest winds 10 knots or less becoming west. sunny.
.friday night...southwest winds 10 knots or less becoming
southeast. a chance of showers overnight. 
.saturday...southeast winds 5 to 15 knots becoming northwest.
showers with a chance of thunderstorms. 
.sunday...northwest winds 5 to 10 knots becoming light and
variable. mainly clear. 
.monday...southwest winds 10 knots or less becoming south 10 to
15 knots. a chance of showers monday night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt thu jul 16 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 weak cold front will move south across the lower great lakes 
tonight. behind the front, a ridge averaging 30.1 inches will build 
southeast through friday before exiting toward southern new england 
friday night. on saturday, a warm front will lift northeast across 
the lower great lakes with a cold front sliding eastward across the 
lake later in the day, as a 29.7 inch low moves eastward across the 
northern great lakes. behind the low and cold front, a 29.9 inch 
ridge will build across lake ontario, slides southeastward across 
the eastern great lakes through monday.


loz063>065-162100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt thu jul 16 2026

.this afternoon...west winds 10 to 15 knots increasing to 15 to
20 knots. smoke. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming northeast 5 to
15 knots. smoke in the evening. waves 2 to 4 feet subsiding to
1 to 3 feet. 
.friday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.friday night...southeast winds 5 to 15 knots. a chance of
showers overnight. waves 2 feet or less. 
.saturday...south winds 15 to 20 knots becoming northwest.
showers with a chance of thunderstorms. waves 1 to 3 feet
building to 3 to 5 feet. 
.sunday...northwest winds 15 to 20 knots becoming west 5 to
15 knots. waves 3 to 5 feet subsiding to 1 foot or less. 
.monday...southwest winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. a chance of showers monday night.
waves 1 foot or less building to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$