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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 16 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.


loz062-170400-
lake ontario open waters from the niagara river to hamlin beach-
402 pm est tue dec 16 2025

...gale warning in effect from 1 am est wednesday through
wednesday afternoon...

.tonight...southwest winds 15 to 25 knots increasing to 35 knot
gales. waves 4 to 7 feet building to 10 to 15 feet. waves
occasionally around 19 feet. 
.wednesday...southwest gales to 35 knots becoming west and
diminishing to 20 to 25 knots in the afternoon. waves 10 to
15 feet subsiding to 7 to 10 feet. waves occasionally around
19 feet. 
.wednesday night...west winds 15 to 20 knots becoming south 10 to
15 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.thursday...south winds 15 to 20 knots increasing to 30 knots. a
chance of rain in the afternoon. waves 1 to 3 feet building to
4 to 7 feet. waves occasionally around 9 feet. 
.thursday night...south winds to 30 knots becoming southwest.
rain. waves 5 to 8 feet building to 6 to 10 feet. waves
occasionally around 13 feet. 
.friday...west gales to 35 knots diminishing to 15 to 25 knots.
rain with snow likely during the day. waves 10 to 15 feet
subsiding to 5 to 8 feet. waves occasionally around 19 feet. 
.saturday...southwest winds 15 to 25 knots increasing to
30 knots. a chance of snow and rain showers. waves 2 to 4 feet
building to 7 to 10 feet. waves occasionally around 13 feet. 
.sunday...west winds to 30 knots becoming northwest and
diminishing to 10 to 15 knots. waves 7 to 11 feet subsiding to
2 to 4 feet. waves occasionally around 14 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 16 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.


loz063-170400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est tue dec 16 2025

...gale warning in effect from late tonight through wednesday
afternoon...

.tonight...southwest winds 15 to 25 knots increasing to 35 knot
gales. waves 2 to 4 feet building to 10 to 14 feet. waves
occasionally around 18 feet. 
.wednesday...southwest gales to 35 knots becoming west and
diminishing to 30 knots in the afternoon. a chance of rain late
in the morning. waves 11 to 16 feet. waves occasionally around
20 feet. 
.wednesday night...west winds 15 to 25 knots becoming south 15 to
20 knots. waves 7 to 10 feet subsiding to 2 to 4 feet. waves
occasionally around 13 feet. 
.thursday...south winds 15 to 25 knots increasing to 30 knots. a
chance of rain in the afternoon. waves 3 to 6 feet building to
5 to 8 feet. waves occasionally around 10 feet. 
.thursday night...south winds to 30 knots becoming southwest.
rain. waves 6 to 10 feet. waves occasionally around 13 feet. 
.friday...west gales to 40 knots diminishing to 30 knots. rain
with snow likely during the day, then a chance of snow showers
friday night. waves 12 to 16 feet building to 13 to 18 feet, then
subsiding to 9 to 12 feet. waves occasionally around 23 feet. 
.saturday...southwest winds 15 to 20 knots increasing to
30 knots. a chance of snow and rain showers. waves 3 to 6 feet
building to 9 to 12 feet. waves occasionally around 15 feet. 
.sunday...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. a chance of snow showers during
the day. waves 10 to 14 feet subsiding to 4 to 7 feet. waves
occasionally around 18 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 16 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.


loz064-065-170400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est tue dec 16 2025

...gale warning in effect from late tonight through wednesday
afternoon...

.tonight...south winds 15 to 25 knots becoming southwest to
30 knots. waves 3 to 5 feet building to 7 to 11 feet. waves
occasionally around 14 feet. 
.wednesday...southwest gales to 35 knots becoming west and
diminishing to 30 knots in the afternoon. a chance of rain. waves
10 to 15 feet building to 11 to 16 feet. waves occasionally
around 20 feet. 
.wednesday night...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 to 30 knots increasing to 35 knot gales.
waves 3 to 6 feet building to 8 to 11 feet. waves occasionally
around 14 feet. 
.thursday night...south gales to 35 knots becoming southwest and
diminishing to 30 knots overnight. rain. waves 7 to 11 feet.
waves occasionally around 14 feet. 
.friday...west gales to 40 knots becoming northwest and
diminishing to 30 knots. rain and snow during the day, then a
chance of snow showers friday night. waves 13 to 17 feet building
to 14 to 19 feet, then subsiding to 10 to 13 feet. waves
occasionally around 24 feet. 
.saturday...west winds 15 to 25 knots becoming southwest to
30 knots. a chance of snow showers during the day, then a chance
of rain and snow showers saturday night. waves 3 to 6 feet
building to 9 to 12 feet. waves occasionally around 15 feet. 
.sunday...west winds to 30 knots becoming northwest and
diminishing to 15 to 20 knots. a chance of snow showers. waves
11 to 15 feet subsiding to 4 to 7 feet. waves occasionally around
19 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est tue dec 16 2025


slz022-170400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est tue dec 16 2025

.tonight...south winds 15 to 20 knots becoming southwest. mostly
cloudy. 
.wednesday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of rain and snow early, then rain and snow
likely late in the morning. a chance of rain early in the
afternoon. 
.wednesday night...west winds 5 to 10 knots becoming south.
mostly cloudy. 
.thursday...south winds 10 to 15 knots increasing to 15 to
20 knots. partly sunny. 
.thursday night...south winds 15 to 25 knots becoming southwest.
rain.
.friday...southwest winds 15 to 20 knots becoming west. rain and
snow during the day, then a chance of snow showers friday night. 
.saturday...southwest winds 5 to 15 knots. a chance of snow
showers during the day, then snow and rain showers likely
saturday night. 
.sunday...southwest winds 5 to 15 knots becoming northwest. a
chance of snow showers during the day. 

$$