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open lake forecast for lake ontario
national weather service buffalo ny
402 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 warm front will lift across the lake today, followed 
by a cold front crossing the lower great lakes later tonight and 
friday morning. a 30.3 inch high will then build into the western 
great lakes friday night and into the eastern great lakes by 
saturday, before exiting into northern new england saturday night 
and into the gulf of saint lawrence sunday. a strong cold front will 
then cross the eastern great lakes sunday night, with another 30.3 
inch high building from the western great lakes into the eastern 
great lakes monday and tuesday.


loz063>065-011500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu oct 1 2026

.today...south winds 10 to 15 knots increasing to 15 to 20 knots.
showers likely early, then a chance of showers. waves 1 to 3 feet
building to 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
403 am edt thu oct 1 2026


slz022-024-011500-
saint lawrence river from cape vincent to saint regis
403 am edt thu oct 1 2026

.today...south winds 5 to 15 knots becoming southwest. a chance
of showers from late morning on. 
.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. 

$$