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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est mon dec 15 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 30.4 inch high over the southeastern states will slide 
off the southeast coast tuesday. a 29.0 inch low over northwest 
ontario province tuesday afternoon will move east to northern quebec 
by wednesday, with a trailing cold front crossing the lake 
wednesday. another 29.0 inch low near lake superior thursday will 
move to northern quebec by friday, with a trailing strong cold front 
crossing the lake late thursday night. 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.


loz063-161000-
lake ontario open waters from hamlin beach to sodus bay-
1002 pm est mon dec 15 2025

.rest of tonight...west winds 15 to 25 knots becoming southwest.
lake effect snow likely late this evening, then a chance of snow
showers after midnight. waves 6 to 9 feet subsiding to 4 to
7 feet. waves occasionally around 11 feet. 
.tuesday...southwest winds 15 to 20 knots. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 25 knots increasing to
30 knots. waves 2 to 4 feet building to 8 to 11 feet. waves
occasionally around 14 feet. 
.wednesday...southwest winds to 30 knots becoming west. waves
8 to 12 feet building to 9 to 13 feet. waves occasionally around
16 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 to 30 knots becoming southwest and
increasing to 35 knot gales. a chance of rain during the day,
then rain thursday night. waves 4 to 7 feet building to 11 to
15 feet. waves occasionally around 19 feet. 
.friday...west gales to 40 knots becoming northwest and
diminishing to 10 to 15 knots. a chance of rain and snow showers
during the day. waves 13 to 17 feet subsiding to 3 to 6 feet.
waves occasionally around 22 feet. 
.saturday...southwest winds 15 to 25 knots. a chance of snow and
rain showers during the day, then a chance of rain showers
saturday night. waves 2 to 4 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est mon dec 15 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 30.4 inch high over the southeastern states will slide 
off the southeast coast tuesday. a 29.0 inch low over northwest 
ontario province tuesday afternoon will move east to northern quebec 
by wednesday, with a trailing cold front crossing the lake 
wednesday. another 29.0 inch low near lake superior thursday will 
move to northern quebec by friday, with a trailing strong cold front 
crossing the lake late thursday night. 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.


loz064-065-161000-
lake ontario open waters from sodus bay to the saint lawrence
river-
1002 pm est mon dec 15 2025

.rest of tonight...west winds 15 to 25 knots. lake effect snow.
waves 6 to 10 feet subsiding to 5 to 8 feet. waves occasionally
around 13 feet. 
.tuesday...southwest winds 15 to 20 knots becoming south. lake
effect snow likely early, then a chance of snow showers. waves
3 to 6 feet. 
.tuesday night...south winds 15 to 25 knots becoming southwest to
30 knots. waves 3 to 6 feet building to 6 to 9 feet. waves
occasionally around 11 feet. 
.wednesday...southwest winds to 30 knots becoming west. a chance
of rain showers. waves 8 to 12 feet building to 10 to 13 feet.
waves occasionally around 16 feet. 
.wednesday night...west winds 15 to 25 knots becoming south.
waves 7 to 10 feet subsiding to 2 to 4 feet. waves occasionally
around 13 feet. 
.thursday...south winds to 30 knots becoming southwest and
increasing to 35 knot gales. a chance of rain during the day,
then rain thursday night. waves 5 to 8 feet building to 10 to
15 feet. waves occasionally around 19 feet. 
.friday...west gales to 35 knots becoming northwest and
diminishing to 10 to 15 knots. snow and rain showers likely
during the day, then a chance of snow showers friday night. waves
13 to 17 feet subsiding to 3 to 6 feet. waves occasionally around
22 feet. 
.saturday...southwest winds 15 to 25 knots. a chance of snow and
rain showers. waves 2 to 4 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est mon dec 15 2025


slz022-161000-
saint lawrence river from cape vincent to ogdensburg-
1002 pm est mon dec 15 2025

.rest of tonight...southwest winds 5 to 15 knots. a chance of
snow showers late this evening. 
.tuesday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. a chance of snow showers through early afternoon. 
.tuesday night...south winds 15 to 25 knots becoming southwest.
mostly cloudy. 
.wednesday...southwest winds 15 to 20 knots. a chance of rain and
snow showers. 
.wednesday night...west winds 10 knots or less becoming south
10 to 15 knots. a chance of rain and snow showers in the evening.
.thursday...south winds 15 to 25 knots becoming southwest. a
chance of rain during the day, then rain thursday night. 
.friday...west winds 15 to 20 knots diminishing to less than
10 knots. snow and rain showers likely during the day, then a
chance of snow showers friday night. 
.saturday...southwest winds 5 to 15 knots. snow showers likely
during the day, then snow showers likely with a chance of rain
showers saturday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm est mon dec 15 2025


slz024-161000-
saint lawrence river from ogdensburg to saint regis-
1002 pm est mon dec 15 2025

.rest of tonight...southwest winds 5 to 10 knots. mostly cloudy. 
.tuesday...southwest winds 5 to 15 knots increasing to 15 to
20 knots. mostly sunny in the morning, then becoming mostly
cloudy. 
.tuesday night...south winds 15 to 25 knots becoming southwest.
mostly cloudy. 
.wednesday...southwest winds 15 to 25 knots. a chance of snow and
rain showers. 
.wednesday night...west winds 5 to 15 knots becoming south. a
chance of rain and snow showers in the evening. 
.thursday...south winds 10 to 15 knots becoming southwest and
increasing to 30 knots. a chance of rain during the day, then
rain thursday night. 
.friday...southwest winds 15 to 25 knots becoming west and
diminishing to 5 to 10 knots. snow and rain showers likely during
the day, then a chance of snow showers friday night. 
.saturday...southwest winds 5 to 15 knots. snow showers likely. 

$$