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open lake forecast for lake ontario
national weather service buffalo ny
402 am est wed dec 17 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 29.0 inch low over northern ontario will move to 
northern quebec by wednesday morning, with its trailing cold front 
crossing the lake during wednesday. a 29.1 inch low near lake 
superior thursday will deepen to 28.9 inches while moving to central 
quebec by friday, with its trailing strong cold front crossing the 
lake early friday morning. in its wake, a 30.1 inch high will slowly 
build across the lake friday night and early saturday, then will 
drift off the atlantic coastline later saturday and saturday night, 
with a 29.5 inch low moving across ontario and quebec and pushing 
its attendant cold front across the lake sunday. a large 30.6 inch 
high will then build east across the lake monday.


loz064-065-171600-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 am est wed dec 17 2025

...gale warning in effect until 4 pm est this afternoon...

.today...southwest gales to 35 knots becoming west and
diminishing to 30 knots this afternoon. a chance of rain showers.
waves 9 to 12 feet building to 11 to 16 feet. waves occasionally
around 20 feet. 
.tonight...west winds 15 to 25 knots becoming south 15 to
20 knots. waves 8 to 11 feet subsiding to 2 to 4 feet. waves
occasionally around 14 feet. 
.thursday...south winds 15 to 25 knots increasing to 30 knots.
waves 3 to 6 feet building to 6 to 9 feet. waves occasionally
around 11 feet. 
.thursday night...south winds to 30 knots. showers. waves 6 to
10 feet. waves occasionally around 13 feet. 
.friday...west gales to 45 knots diminishing to 30 knots. lake
effect rain and snow showers during the day, then lake effect
snow showers friday night. waves 10 to 14 feet building to 16 to
21 feet, then subsiding to 10 to 14 feet. waves occasionally
around 27 feet. 
.saturday...west winds 15 to 25 knots becoming southwest to
30 knots. a chance of snow and rain showers during the day, then
rain showers likely with a chance of snow showers saturday night.
waves 3 to 6 feet building to 7 to 10 feet. waves occasionally
around 13 feet. 
.sunday...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. a chance of snow and rain showers
during the day. waves 10 to 13 feet subsiding to 4 to 7 feet.
waves occasionally around 16 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est wed dec 17 2025


slz022-171600-
saint lawrence river from cape vincent to ogdensburg-
402 am est wed dec 17 2025

.today...southwest winds 15 to 20 knots becoming west. a chance
of rain showers. 
.tonight...west winds 5 to 15 knots becoming south 10 knots or
less. mostly cloudy. 
.thursday...south winds 5 to 15 knots increasing to 15 to
20 knots. partly sunny. 
.thursday night...south winds 15 to 25 knots. showers.
.friday...southwest winds 15 to 25 knots becoming west. lake
effect rain and snow showers during the day, then snow showers
likely friday night. 
.saturday...southwest winds 5 to 15 knots. a chance of snow
showers during the day, then snow showers, rain showers likely
with a chance of freezing rain saturday night. 
.sunday...southwest winds 5 to 15 knots becoming northwest. a
chance of snow showers and freezing rain during the day. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est wed dec 17 2025


slz024-171600-
saint lawrence river from ogdensburg to saint regis-
402 am est wed dec 17 2025

.today...southwest winds 15 to 25 knots becoming west. a chance
of rain and snow showers late this morning. a chance of rain
showers early this afternoon, then a chance of rain and snow
showers late. 
.tonight...west winds 15 to 20 knots becoming south 5 to
15 knots. partly cloudy. 
.thursday...south winds 5 to 15 knots increasing to 15 to
20 knots. partly sunny. 
.thursday night...south winds 15 to 25 knots. a chance of showers
in the evening, then showers overnight. 
.friday...southwest winds 15 to 25 knots becoming west. lake
effect rain showers with lake effect snow showers likely during
the day, then snow showers likely friday night. 
.saturday...west winds 5 to 15 knots becoming southwest 15 to
20 knots. a chance of snow showers during the day, then snow
showers likely saturday night. 
.sunday...southwest winds 15 to 20 knots becoming west 5 to
15 knots. snow showers likely during the day. 

$$