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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun oct 19 2025

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 29.3 inch low will continue to move north to james bay 
through tonight, with a trailing cold front crossing the lake. 
another 29.6 inch low will develop along the frontal boundary 
overnight, with this low moving north into quebec by monday night. 
another 29.4 inch low will then move into the upper great lakes 
tuesday night and wednesday before consolidating with the low over 
central quebec by wednesday night. this low will then move to far 
northern quebec by friday.


loz063>065-192100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun oct 19 2025

.this afternoon...southeast winds 15 to 25 knots becoming south to
30 knots. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.tonight...south winds to 30 knots becoming west. showers. waves
5 to 8 feet. waves occasionally around 10 feet. 
.monday...northwest winds to 30 knots becoming west. showers.
waves 6 to 10 feet building to 10 to 13 feet. waves occasionally
around 16 feet. 
.monday night...west winds to 30 knots diminishing to 15 to
25 knots. showers likely in the evening, then a chance of showers
overnight. waves 10 to 13 feet subsiding to 3 to 6 feet. waves
occasionally around 16 feet. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers. waves 3 to 5 feet. 
.wednesday...southwest winds 15 to 25 knots increasing to
30 knots. showers. waves 3 to 6 feet building to 5 to 8 feet.
waves occasionally around 10 feet. 
.thursday...southwest winds to 30 knots becoming west 15 to
25 knots. showers. waves 5 to 9 feet subsiding to 3 to 6 feet.
waves occasionally around 11 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 am edt sun oct 19 2025


slz022-024-192100-
saint lawrence river from cape vincent to saint regis
1002 am edt sun oct 19 2025

.this afternoon...south winds 15 to 20 knots. mostly sunny. 
.tonight...south winds 15 to 25 knots. a chance of showers late
in the evening. showers after midnight. 
.monday...northwest winds 5 to 15 knots. showers.
.monday night...west winds 5 to 15 knots. showers.
.tuesday...southwest winds 5 to 10 knots becoming south. showers.
.wednesday...south winds 5 to 10 knots becoming southwest.
showers.
.thursday...southwest winds 5 to 15 knots. rain showers. 

$$