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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sat nov 29 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 30.5 inch surface high will drift along the northeast 
coast to the canadian maritimes through tonight. a surface low will 
cut northeastward through the central great lakes sunday, slowly 
deepening from 29.6 inches sunday morning to 29.4 inches sunday 
night over western quebec. a cold front from this low will cross the 
lake late sunday night. a 30.4 inch surface high centered over the 
central plains will then build east across the great lakes monday, 
sliding quickly to new england on tuesday. a 29.7 inch surface low 
off the carolina coastline tuesday morning will deepen to 28.9 
inches over southern atlantic canada by early wednesday morning 
before going out to sea. a 30.2 inch surface high will build across 
the ohio valley and lower great lakes later wednesday into thursday 
morning before pushing off the coast. a large 29.2 inch surface low 
near hudson bay will push its cold front across the lake on thursday.


loz063-300400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est sat nov 29 2025

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

.tonight...south winds less than 10 knots becoming southeast and
increasing to 30 knots after midnight. a chance of snow showers
late this evening. snow showers after midnight. waves 1 to 2 feet
building to 3 to 6 feet. 
.sunday...south winds to 30 knots becoming southwest. snow
showers likely early, then snow and rain showers likely late in
the morning. rain showers likely in the afternoon. waves 5 to
9 feet building to 9 to 12 feet. waves occasionally around
15 feet. 
.sunday night...southwest gales to 35 knots becoming northwest
and diminishing to 30 knots overnight. a chance of rain and snow
showers. waves 11 to 16 feet subsiding to 9 to 12 feet. waves
occasionally around 20 feet. 
.monday...northwest winds 15 to 25 knots becoming west and
diminishing to 5 to 15 knots. waves 7 to 10 feet subsiding to
1 to 3 feet. waves occasionally around 13 feet. 
.monday night...south winds 5 to 15 knots increasing to 15 to
20 knots. snow showers likely overnight. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming northwest 10 to
15 knots. snow showers likely during the day, then a chance of
snow showers tuesday night. waves 1 to 3 feet. 
.wednesday...west winds 15 to 25 knots increasing to 30 knots.
snow showers likely wednesday night. waves 2 to 4 feet building
to 7 to 10 feet. waves occasionally around 13 feet. 
.thursday...west winds to 30 knots becoming southwest 15 to
25 knots. snow showers likely during the day, then a chance of
snow showers thursday night. waves 7 to 10 feet subsiding to 3 to
5 feet. waves occasionally around 13 feet. 

$$

fzus61 kbuf 292102
glflo 
expires:202511300400;;727133

open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sat nov 29 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 30.5 inch surface high will drift along the northeast 
coast to the canadian maritimes through tonight. a surface low will 
cut northeastward through the central great lakes sunday, slowly 
deepening from 29.6 inches sunday morning to 29.4 inches sunday 
night over western quebec. a cold front from this low will cross the 
lake late sunday night. a 30.4 inch surface high centered over the 
central plains will then build east across the great lakes monday, 
sliding quickly to new england on tuesday. a 29.7 inch surface low 
off the carolina coastline tuesday morning will deepen to 28.9 
inches over southern atlantic canada by early wednesday morning 
before going out to sea. a 30.2 inch surface high will build across 
the ohio valley and lower great lakes later wednesday into thursday 
morning before pushing off the coast. a large 29.2 inch surface low 
near hudson bay will push its cold front across the lake on thursday.


loz064-065-300400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est sat nov 29 2025

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

.tonight...southwest winds less than 10 knots becoming southeast
and increasing to 30 knots after midnight. a chance of snow
showers after midnight. snow showers late. waves 2 feet or less
building to 4 to 7 feet. waves occasionally around 9 feet. 
.sunday...south winds to 30 knots becoming southwest and
increasing to 35 knot gales in the afternoon. snow showers likely
early, then snow showers with rain showers likely. rain showers
likely late. waves 6 to 10 feet building to 8 to 12 feet. waves
occasionally around 15 feet. 
.sunday night...southwest gales to 35 knots becoming northwest
and diminishing to 30 knots overnight. rain showers with snow
showers likely. waves 10 to 14 feet building to 12 to 16 feet,
then subsiding to 10 to 13 feet. waves occasionally around
20 feet. 
.monday...northwest winds 15 to 25 knots becoming west and
diminishing to 5 to 15 knots. waves 7 to 10 feet subsiding to
1 to 3 feet. waves occasionally around 13 feet. 
.monday night...southwest winds 10 knots or less becoming south
and increasing to 15 to 20 knots overnight. snow showers likely
overnight. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming northwest 10 to
15 knots. snow showers likely during the day, then a chance of
snow showers tuesday night. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.wednesday...west winds 15 to 25 knots increasing to 30 knots. a
chance of snow showers during the day, then snow showers
wednesday night. waves 2 to 4 feet building to 8 to 11 feet.
waves occasionally around 14 feet. 
.thursday...west winds to 30 knots becoming southwest 15 to
25 knots. snow showers during the day, then a chance of snow
showers thursday night. waves 7 to 11 feet subsiding to 3 to
6 feet. waves occasionally around 14 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est sat nov 29 2025


slz022-300400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sat nov 29 2025

.tonight...light and variable winds becoming southeast 10 to
15 knots. a chance of snow showers after midnight. snow showers
late. 
.sunday...southeast winds 15 to 20 knots becoming south. snow
showers in the morning, then snow and rain showers in the
afternoon. 
.sunday night...southwest winds 15 to 25 knots becoming
northwest. rain and snow showers. 
.monday...northwest winds 5 to 15 knots becoming southwest less
than 10 knots. a chance of snow showers in the morning. 
.monday night...light and variable winds becoming south 5 to
10 knots. a chance of snow showers overnight. 
.tuesday...south winds 10 knots or less becoming northwest. snow
showers likely during the day. 
.wednesday...southwest winds 5 to 15 knots becoming west. a
chance of snow showers during the day, then snow showers
wednesday night. 
.thursday...west winds 5 to 15 knots becoming south. snow showers
during the day, then a chance of snow showers thursday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est sat nov 29 2025


slz024-300400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sat nov 29 2025

.tonight...light and variable winds becoming southeast 5 to
10 knots. snow showers likely late. 
.sunday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. snow showers through early afternoon, then rain and
snow showers likely late. 
.sunday night...southwest winds 15 to 25 knots becoming
northwest. rain and snow showers in the evening, then snow
showers overnight. 
.monday...northwest winds 15 to 20 knots becoming west and
diminishing to less than 10 knots in the afternoon. a chance of
snow showers in the morning. 
.monday night...light and variable winds. a chance of snow
showers overnight. 
.tuesday...south winds 5 to 10 knots becoming light and variable.
snow showers likely during the day. 
.wednesday...southwest winds 5 to 15 knots becoming west. snow
showers wednesday night. 
.thursday...west winds 5 to 15 knots becoming southwest. snow
showers during the day. 

$$