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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue nov 25 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 29.6 inch low over the western great lakes this 
evening will track toward the central great lakes wednesday, then 
track into eastern ontario through wednesday night while deepening 
to 29.4 inches. a cold front from this low will rush across the lake 
wednesday afternoon. the 29.4 inch surface low will then track well 
north of the lake thursday and friday, as a 30.4 inch surface high 
builds into the mid mississippi valley friday and to the ohio valley 
saturday. another surface low will cut northeastward through the 
central great lakes sunday, deepening from 29.6 inches sunday 
morning to 29.4 inches sunday night over western quebec.


loz063-260400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est tue nov 25 2025

...gale warning in effect from wednesday afternoon through friday
evening...

.tonight...southeast winds 10 to 15 knots becoming south. showers
early, then a chance of showers late this evening. showers likely
after midnight. waves 2 feet or less. 
.wednesday...south winds 10 to 15 knots becoming southwest and
increasing to 30 knots in the afternoon. showers. waves 1 to
3 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.wednesday night...southwest gales to 35 knots. lake effect rain
showers likely in the evening, then lake effect rain and snow
showers likely overnight. waves 10 to 14 feet building to 12 to
16 feet. waves occasionally around 20 feet. 
.thursday...southwest gales to 40 knots becoming west. lake
effect rain and snow showers likely in the morning, then lake
effect rain with lake effect snow showers likely in the
afternoon. waves 14 to 19 feet. waves occasionally around
24 feet. 
.thursday night...west gales to 40 knots diminishing to 35 knots.
lake effect snow with lake effect rain showers likely in the
evening, then lake effect snow overnight. waves 15 to 19 feet
subsiding to 11 to 15 feet. waves occasionally around 24 feet. 
.friday...northwest gales to 35 knots diminishing to 30 knots.
lake effect snow during the day, then lake effect snow showers
likely friday night. waves 10 to 15 feet subsiding to 7 to
10 feet. waves occasionally around 19 feet. 
.saturday...northwest winds 15 to 20 knots becoming south. snow
showers likely saturday night. waves 3 to 6 feet subsiding to
3 to 5 feet. 
.sunday...south winds 15 to 25 knots becoming west. rain and snow
showers likely during the day, then rain showers likely with a
chance of snow showers sunday night. waves 3 to 6 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue nov 25 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 29.6 inch low over the western great lakes this 
evening will track toward the central great lakes wednesday, then 
track into eastern ontario through wednesday night while deepening 
to 29.4 inches. a cold front from this low will rush across the lake 
wednesday afternoon. the 29.4 inch surface low will then track well 
north of the lake thursday and friday, as a 30.4 inch surface high 
builds into the mid mississippi valley friday and to the ohio valley 
saturday. another surface low will cut northeastward through the 
central great lakes sunday, deepening from 29.6 inches sunday 
morning to 29.4 inches sunday night over western quebec.


loz064-065-260400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est tue nov 25 2025

...gale warning in effect from wednesday afternoon through friday
evening...

.tonight...southeast winds 10 to 15 knots becoming south.
showers. waves 1 to 3 feet. 
.wednesday...south winds 10 to 15 knots becoming southwest and
increasing to 30 knots in the afternoon. showers. waves 1 to
3 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.wednesday night...west gales to 35 knots becoming southwest.
rain showers in the evening, then lake effect rain with a chance
of lake effect snow showers overnight. waves 10 to 15 feet. waves
occasionally around 19 feet. 
.thursday...southwest gales to 40 knots becoming west. lake
effect rain with lake effect snow showers likely in the morning,
then lake effect rain and snow in the afternoon. waves 14 to
19 feet building to 15 to 20 feet. waves occasionally around
26 feet. 
.thursday night...west gales to 40 knots diminishing to 35 knots.
lake effect snow and lake effect rain in the evening, then lake
effect snow overnight. waves 14 to 19 feet subsiding to 12 to
17 feet. waves occasionally around 24 feet. 
.friday...northwest gales to 35 knots diminishing to 30 knots.
lake effect snow showers likely. waves 10 to 15 feet subsiding to
7 to 10 feet. waves occasionally around 19 feet. 
.saturday...northwest winds 15 to 25 knots becoming south. snow
showers likely saturday night. waves 4 to 7 feet subsiding to
3 to 5 feet. waves occasionally around 9 feet. 
.sunday...south winds to 30 knots becoming west and diminishing
to 15 to 20 knots. rain showers with snow showers likely. waves
5 to 8 feet subsiding to 3 to 6 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
402 pm est tue nov 25 2025


slz022-260400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est tue nov 25 2025

...small craft advisory in effect from wednesday evening through
thursday evening...

.tonight...southeast winds less than 10 knots. showers.
.wednesday...southeast winds 10 knots or less becoming southwest
and increasing to 15 to 20 knots in the afternoon. showers.
.wednesday night...southwest winds 15 to 25 knots. lake effect
rain in the evening, then lake effect rain and snow overnight. 
.thursday...southwest winds 15 to 25 knots. lake effect rain and
snow in the morning, then lake effect rain and snow showers
likely in the afternoon. 
.thursday night...southwest winds 15 to 25 knots becoming west.
lake effect snow and rain showers likely in the evening, then
lake effect snow showers likely overnight. 
.friday...west winds 15 to 20 knots diminishing to 5 to 10 knots.
snow showers likely during the day. 
.saturday...west winds 10 knots or less becoming southeast. snow
showers likely saturday night. 
.sunday...south winds 5 to 15 knots becoming southwest. rain and
snow showers. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est tue nov 25 2025


slz024-260400-
saint lawrence river from ogdensburg to saint regis-
402 pm est tue nov 25 2025

...small craft advisory in effect from wednesday evening through
thursday evening...

.tonight...light and variable winds. rain showers. 
.wednesday...east winds 10 knots or less becoming south. rain
showers. 
.wednesday night...southwest winds 10 to 15 knots increasing to
15 to 20 knots. lake effect rain in the evening, then snow
showers likely with a chance of rain showers overnight. 
.thursday...southwest winds 15 to 25 knots. lake effect snow and
rain showers likely. 
.thursday night...southwest winds 15 to 25 knots becoming west.
lake effect snow and rain showers likely in the evening, then
lake effect snow showers likely overnight. 
.friday...west winds 15 to 20 knots diminishing to 10 to
15 knots. snow showers likely during the day. 
.saturday...west winds 10 knots or less becoming southeast. snow
showers likely saturday night. 
.sunday...southeast winds 5 to 10 knots becoming southwest. rain
and snow showers. 

$$