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open lake forecast for lake ontario
national weather service buffalo ny
1003 am 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 30.2 inch high will settle over the lower great lakes 
tonight. this high will then drift to the eastern seaboard tuesday, 
then east of the mid atlantic coast by wednesday. meanwhile, a 29.3 
inch low over far northwest ontario province tuesday night will move 
to hudson bay by late wednesday, then to northern quebec by thursday 
while deepening to 29.0 inches. a trailing cold front will cross the 
lower great lakes wednesday night, 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.


loz062-012100-
lake ontario open waters from the niagara river to hamlin beach-
1003 am edt thu oct 1 2026

.rest of today...south winds 10 to 15 knots becoming southwest
15 to 20 knots. showers likely late this morning, then a chance
of showers this afternoon. waves 1 to 3 feet. 
.tonight...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of showers early, then showers from late
evening on. waves 2 to 3 feet. 
.friday...west winds 10 to 15 knots becoming northwest 15 to
20 knots. showers in the morning. waves 2 to 3 feet. 
.friday night...northwest winds 15 to 20 knots becoming north
10 to 15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.saturday...northeast winds 10 knots or less becoming southeast.
waves 2 feet or less. 
.sunday...south winds 10 knots or less becoming west and
increasing to 15 to 20 knots. waves 1 to 3 feet. 
.monday...northwest winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 

$$

fzus61 kbuf 011403
glflo 
expires:202610012100;;357599

open lake forecast for lake ontario
national weather service buffalo ny
1003 am 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 30.2 inch high will settle over the lower great lakes 
tonight. this high will then drift to the eastern seaboard tuesday, 
then east of the mid atlantic coast by wednesday. meanwhile, a 29.3 
inch low over far northwest ontario province tuesday night will move 
to hudson bay by late wednesday, then to northern quebec by thursday 
while deepening to 29.0 inches. a trailing cold front will cross the 
lower great lakes wednesday night, 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.


loz063>065-012100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 am edt thu oct 1 2026

.rest of today...south winds 15 to 20 knots. a chance of showers.
waves 2 to 4 feet. 
.tonight...southwest winds 10 to 15 knots becoming west. a chance
of showers in the evening, then showers after midnight. waves
1 to 3 feet. 
.friday...west winds 15 to 20 knots. showers in the morning, then
a chance of showers in the afternoon. waves 1 to 3 feet building
to 3 to 5 feet. 
.friday night...northwest winds 15 to 20 knots becoming north
10 to 15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.saturday...northeast winds 5 to 15 knots becoming southeast.
waves 1 to 3 feet subsiding to 1 foot or less. 
.sunday...south winds 15 to 20 knots becoming west. waves 1 to
3 feet building to 2 to 4 feet. 
.monday...northwest winds 15 to 25 knots. waves 3 to 6 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt thu oct 1 2026


slz022-024-012100-
saint lawrence river from cape vincent to saint regis
1003 am edt thu oct 1 2026

.this afternoon...southwest winds 10 to 15 knots. a chance of
showers. 
.tonight...southwest winds 5 to 15 knots. showers.
.friday...west winds 5 to 10 knots becoming northwest. showers in
the morning, then a chance of showers in the afternoon. 
.friday night...northwest winds 5 to 10 knots. partly cloudy in
the evening, then becoming mainly clear. 
.saturday...north winds less than 10 knots. 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 becoming northwest. a chance
of rain showers during the day. 

$$