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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 23 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 29.8 inch surface low over central ontario this afternoon with a 
warm front draped over the lake, will slide off the southern new 
england coastline wednesday as a 29.6 inch surface low. following 
the passage of this system, a 30.3 inch high will then build across 
the lake wednesday, sliding off the atlantic coastline thursday. a 
weak 29.8 inch surface low will slide across southern quebec 
thursday with its associated cold front dropping southward across 
the lake. following this front, a strong 30.5 inch surface high over 
ontario thursday will slide over the lake thursday night and then 
linger just to the east of the lake friday. a compact 29.6 inch 
surface low will slide well south of the lake across ohio and 
southern pennsylvania friday night into saturday. another 29.5 inch 
surface low will pass by to the northeast of the lake sunday.


loz062-240400-
lake ontario open waters from the niagara river to hamlin beach-
402 pm est tue dec 23 2025

.tonight...west winds to 30 knots becoming northwest. waves 5 to
8 feet building to 7 to 10 feet. waves occasionally around
13 feet. 
.wednesday...northwest winds 15 to 25 knots becoming west and
diminishing to 5 to 10 knots in the afternoon. waves 6 to 9 feet
subsiding to 1 to 3 feet. waves occasionally around 11 feet. 
.wednesday night...southwest winds 10 knots or less becoming
west. waves 1 foot or less. 
.thursday...west winds 10 to 15 knots becoming north. waves 1 to
3 feet. 
.thursday night...north winds 15 to 20 knots becoming east. waves
2 to 4 feet building to 3 to 5 feet. 
.friday...east winds to 30 knots diminishing to 15 to 20 knots.
snow. waves 4 to 7 feet building to 6 to 9 feet, then subsiding
to 4 to 7 feet. waves occasionally around 11 feet. 
.saturday...east winds 10 to 15 knots becoming southeast. a
chance of rain showers saturday night. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.sunday...south winds 15 to 20 knots becoming west and increasing
to 40 knot gales. rain showers during the day, then snow and rain
showers likely sunday night. waves 2 to 4 feet building to 12 to
16 feet. waves occasionally around 20 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 23 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 29.8 inch surface low over central ontario this afternoon with a 
warm front draped over the lake, will slide off the southern new 
england coastline wednesday as a 29.6 inch surface low. following 
the passage of this system, a 30.3 inch high will then build across 
the lake wednesday, sliding off the atlantic coastline thursday. a 
weak 29.8 inch surface low will slide across southern quebec 
thursday with its associated cold front dropping southward across 
the lake. following this front, a strong 30.5 inch surface high over 
ontario thursday will slide over the lake thursday night and then 
linger just to the east of the lake friday. a compact 29.6 inch 
surface low will slide well south of the lake across ohio and 
southern pennsylvania friday night into saturday. another 29.5 inch 
surface low will pass by to the northeast of the lake sunday.


loz063-240400-
lake ontario open waters from hamlin beach to sodus bay-
402 pm est tue dec 23 2025

.tonight...west winds to 30 knots becoming northwest. waves 4 to
7 feet building to 9 to 13 feet. waves occasionally around
16 feet. 
.wednesday...northwest winds to 30 knots diminishing to 5 to
15 knots. waves 8 to 11 feet subsiding to 1 to 3 feet. waves
occasionally around 14 feet. 
.wednesday night...west winds 5 to 15 knots becoming southwest.
waves 1 to 2 feet. 
.thursday...west winds 10 to 15 knots becoming north 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday night...north winds 15 to 20 knots becoming northeast.
waves 3 to 5 feet. 
.friday...east winds 15 to 25 knots becoming southeast. snow.
waves 3 to 6 feet building to 4 to 7 feet, then subsiding to 3 to
6 feet. waves occasionally around 9 feet. 
.saturday...east winds 15 to 20 knots becoming southeast. a
chance of rain showers saturday night. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.sunday...south winds 15 to 25 knots becoming west and increasing
to 40 knot gales. rain showers during the day, then snow showers
with rain showers likely sunday night. waves 3 to 6 feet building
to 15 to 20 feet. waves occasionally around 26 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est tue dec 23 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 29.8 inch surface low over central ontario this afternoon with a 
warm front draped over the lake, will slide off the southern new 
england coastline wednesday as a 29.6 inch surface low. following 
the passage of this system, a 30.3 inch high will then build across 
the lake wednesday, sliding off the atlantic coastline thursday. a 
weak 29.8 inch surface low will slide across southern quebec 
thursday with its associated cold front dropping southward across 
the lake. following this front, a strong 30.5 inch surface high over 
ontario thursday will slide over the lake thursday night and then 
linger just to the east of the lake friday. a compact 29.6 inch 
surface low will slide well south of the lake across ohio and 
southern pennsylvania friday night into saturday. another 29.5 inch 
surface low will pass by to the northeast of the lake sunday.


loz064-065-240400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est tue dec 23 2025

.tonight...west winds 15 to 25 knots becoming northwest to
30 knots. a chance of rain showers early. a chance of rain
showers after midnight. waves 4 to 7 feet building to 10 to
13 feet. waves occasionally around 16 feet. 
.wednesday...northwest winds to 30 knots diminishing to 5 to
15 knots. waves 8 to 11 feet subsiding to 1 to 3 feet. waves
occasionally around 14 feet. 
.wednesday night...west winds 5 to 15 knots becoming south. waves
2 feet or less. 
.thursday...southwest winds 10 to 15 knots becoming north and
increasing to 15 to 25 knots. waves 1 to 3 feet building to 3 to
5 feet. 
.thursday night...north winds 15 to 25 knots becoming northeast.
waves 3 to 6 feet subsiding to 2 to 4 feet. 
.friday...east winds 15 to 25 knots becoming southeast. a chance
of snow showers during the day, then snow friday night. waves
2 to 4 feet building to 3 to 5 feet. 
.saturday...southeast winds 15 to 20 knots. a chance of snow
showers during the day, then a chance of rain showers saturday
night. waves 2 to 4 feet. 
.sunday...south winds to 30 knots becoming west and increasing to
40 knot gales. rain showers during the day, then snow and rain
showers sunday night. waves 3 to 6 feet building to 15 to
20 feet. waves occasionally around 26 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 23 2025


slz022-240400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est tue dec 23 2025

.tonight...southwest winds 5 to 15 knots becoming northwest. snow
showers with rain showers likely this evening, then rain and snow
showers likely after midnight. 
.wednesday...northwest winds 5 to 15 knots diminishing to less
than 10 knots. partly to mostly sunny. 
.wednesday night...light and variable winds becoming southwest
5 to 10 knots. a chance of snow showers overnight. 
.thursday...southwest winds 10 knots or less becoming north 10 to
15 knots. a chance of snow showers in the morning. 
.thursday night...north winds 5 to 15 knots becoming northeast.
partly cloudy. 
.friday...northeast winds 5 to 10 knots. a chance of snow showers
during the day, then snow likely friday night. 
.saturday...northeast winds 10 knots or less becoming east. a
chance of snow showers. 
.sunday...southeast winds 5 to 15 knots becoming west 15 to
20 knots. rain and snow showers. 

$$