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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est thu dec 18 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 near lake superior 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.


loz063-190400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est thu dec 18 2025

...gale warning in effect from friday morning through late friday
night...

.tonight...south winds to 30 knots. a chance of showers early,
then showers from late evening on. waves 3 to 6 feet building to
5 to 8 feet. waves occasionally around 10 feet. 
.friday...southwest winds to 30 knots becoming west and
increasing to 40 knot gales in the afternoon. rain showers early,
then rain likely late in the morning. a chance of snow showers
late. waves 5 to 8 feet building to 15 to 19 feet. waves
occasionally around 24 feet. 
.friday night...west gales to 40 knots diminishing to 30 knots. a
chance of snow showers in the evening. waves 15 to 20 feet
subsiding to 11 to 15 feet. waves occasionally around 26 feet. 
.saturday...west winds 15 to 20 knots becoming south. waves 6 to
9 feet subsiding to 2 to 4 feet. waves occasionally around
11 feet. 
.saturday night...south winds 15 to 25 knots becoming west and
increasing to 35 knot gales overnight. a chance of rain showers
in the evening, then a chance of rain and snow showers overnight.
waves 3 to 6 feet building to 10 to 13 feet. waves occasionally
around 16 feet. 
.sunday...west gales to 40 knots becoming northwest and
diminishing to 15 to 25 knots. a chance of snow showers. waves
13 to 17 feet subsiding to 6 to 9 feet. waves occasionally around
22 feet. 
.monday...northwest winds 15 to 20 knots becoming south. a chance
of snow showers monday night. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.tuesday...south winds 15 to 20 knots becoming northwest. a
chance of rain and snow showers during the day, then a chance of
rain showers tuesday night. waves 2 to 4 feet building to 4 to
7 feet. waves occasionally around 9 feet. 

$$

fzus61 kbuf 182102
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est thu dec 18 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 near lake superior 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.


loz064-065-190400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est thu dec 18 2025

...gale warning in effect from friday morning through late friday
night...

.tonight...south winds to 30 knots. showers from late evening on.
waves 5 to 8 feet building to 6 to 9 feet. waves occasionally
around 11 feet. 
.friday...southwest winds to 30 knots becoming west and
increasing to 45 knot gales in the afternoon. rain in the
morning, then a chance of snow showers and rain in the afternoon.
waves 6 to 9 feet building to 15 to 20 feet. waves occasionally
around 26 feet. 
.friday night...west gales to 45 knots diminishing to 30 knots. a
chance of snow showers. waves 16 to 21 feet subsiding to 11 to
15 feet. waves occasionally around 27 feet. 
.saturday...west winds 15 to 25 knots becoming south. waves 7 to
10 feet subsiding to 3 to 6 feet. waves occasionally around
13 feet. 
.saturday night...south winds to 30 knots becoming southwest and
increasing to 35 knot gales overnight. a chance of rain showers
in the evening, then a chance of rain and snow showers overnight.
waves 3 to 6 feet building to 10 to 13 feet. waves occasionally
around 16 feet. 
.sunday...west gales to 40 knots becoming northwest and
diminishing to 15 to 25 knots. lake effect snow showers likely.
waves 12 to 17 feet subsiding to 7 to 10 feet. waves occasionally
around 22 feet. 
.monday...northwest winds 15 to 20 knots becoming south. a chance
of snow showers monday night. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.tuesday...south winds 15 to 25 knots becoming northwest. rain
and snow showers likely during the day, then a chance of rain
showers tuesday night. waves 3 to 6 feet building to 4 to 7 feet.
waves occasionally around 9 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est thu dec 18 2025


slz022-190400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est thu dec 18 2025

.tonight...south winds 15 to 25 knots. showers from late evening
on. 
.friday...south winds 15 to 25 knots becoming southwest. rain in
the morning, then a chance of rain and snow showers in the
afternoon. 
.friday night...west winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of snow showers. 
.saturday...west winds 5 to 15 knots becoming south. mostly sunny
in the morning, then becoming mostly cloudy. 
.saturday night...south winds 15 to 20 knots becoming southwest.
rain and snow showers likely. 
.sunday...southwest winds 15 to 20 knots becoming northwest 5 to
15 knots. a chance of snow showers during the day. 
.monday...west winds 10 knots or less becoming south. a chance of
snow showers monday night. 
.tuesday...south winds 5 to 10 knots becoming west. snow and rain
showers likely. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est thu dec 18 2025


slz024-190400-
saint lawrence river from ogdensburg to saint regis-
402 pm est thu dec 18 2025

.tonight...south winds 15 to 25 knots. a chance of showers late
this evening. showers after midnight. 
.friday...south winds 15 to 25 knots becoming southwest to
30 knots. rain showers early, then rain. 
.friday night...west winds to 30 knots diminishing to 15 to
25 knots. a chance of snow showers. 
.saturday...west winds 5 to 15 knots becoming south. mostly sunny
in the morning, then becoming mostly cloudy. 
.saturday night...south winds 5 to 10 knots becoming southwest
and increasing to 15 to 20 knots. snow and rain showers likely. 
.sunday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of snow showers during the day. 
.monday...west winds 10 knots or less becoming south. a chance of
snow showers monday night. 
.tuesday...south winds 5 to 10 knots becoming west. snow showers
likely. 

$$