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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt thu oct 1 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 29.7 inch low over western quebec province this 
afternoon will continue to traverse to northern quebec by thursday 
while deepening to 29.0 inches. a trailing cold front will cross the 
lower great lakes tonight, with a 30.0 inch high building east 
across the eastern great lakes region thursday through friday, 
before sliding east into new england by saturday. a 29.8 inch low 
over northern ontario province will introduce a pair of fronts 
sunday and sunday night, with a 30.4 inch high over the central 
plains building across the region monday.


loz063>065-020300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt thu oct 1 2026

.tonight...southwest winds 10 to 15 knots becoming west. a chance
of showers late this evening. showers after midnight. waves 1 to
3 feet. 
.friday...west winds 10 to 15 knots increasing to 15 to 20 knots.
showers in the morning. waves 1 to 3 feet building to 2 to
4 feet. 
.friday night...northwest winds 15 to 20 knots becoming north
10 to 15 knots. waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 
.saturday...northeast winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 
.saturday night...northeast winds 5 to 10 knots becoming
southeast. waves 1 foot or less. 
.sunday...southeast winds 15 to 20 knots becoming west. a chance
of showers sunday night. waves 1 to 3 feet building to 3 to
5 feet. 
.monday...northwest winds to 30 knots diminishing to 15 to
25 knots. a chance of showers during the day. waves 5 to 8 feet
subsiding to 3 to 6 feet. waves occasionally around 10 feet. 
.tuesday...northwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 2 to 4 feet subsiding to 1 to
3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt thu oct 1 2026


slz022-024-020300-
saint lawrence river from cape vincent to saint regis
403 pm edt thu oct 1 2026

.tonight...southwest winds 5 to 15 knots. a chance of showers
early, then showers from late evening on. 
.friday...west winds less than 10 knots becoming northwest.
showers likely early, then a chance of showers late in the
morning. 
.friday night...northwest winds 10 knots or less. becoming mainly
clear. 
.saturday...northwest winds less than 10 knots becoming north.
sunny.
.saturday night...light and variable winds. mainly clear. 
.sunday...southeast winds 5 to 10 knots becoming southwest. a
chance of rain showers sunday night. 
.monday...west winds 5 to 15 knots. a chance of rain showers
during the day. 
.tuesday...west winds 10 knots or less becoming southwest. mainly
clear. 

$$