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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est sat dec 27 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 ridge of high pressure averaging 30.2 inches will 
build into quebec and new england through tonight. low pressure 
averaging 29.1 inches will then cross the lower great lakes sunday 
night, before moving to northern new england and southern quebec 
monday, then to the canadian maritimes by tuesday while deepening to 
28.8 inches. a trough, averaging 29.6 inches, will drop southward 
across the lake thursday.


loz064-065-280400-
lake ontario open waters from sodus bay to the saint lawrence
river-
402 pm est sat dec 27 2025

...gale watch in effect from monday morning through late tuesday
night...

.tonight...northeast winds 5 to 10 knots becoming southeast.
waves 1 foot or less. 
.sunday...southeast winds 10 to 15 knots. rain likely late. waves
2 feet or less. 
.sunday night...southeast winds 15 to 25 knots. rain. waves 1 to
3 feet building to 3 to 5 feet. 
.monday...south winds to 30 knots becoming southwest and
increasing to 45 knot gales in the afternoon. rain and snow
showers in the morning, then rain and snow showers in the
afternoon. waves 3 to 6 feet building to 15 to 20 feet. waves
occasionally around 26 feet. 
.monday night...southwest gales to 45 knots becoming west to
40 knots. lake effect snow showers. waves 16 to 21 feet. waves
occasionally around 27 feet. 
.tuesday...northwest gales to 40 knots becoming west and
diminishing to 30 knots. lake effect snow showers. waves 15 to
19 feet subsiding to 10 to 13 feet. waves occasionally around
24 feet. 
.wednesday...west winds to 30 knots becoming northwest 15 to
25 knots. lake effect snow showers. waves 10 to 14 feet. waves
occasionally around 18 feet. 
.thursday...northwest winds 15 to 20 knots becoming west. lake
effect snow showers. waves 7 to 10 feet building to 8 to 12 feet.
waves occasionally around 15 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 dec 27 2025


slz022-280400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est sat dec 27 2025

.tonight...northeast winds less than 10 knots. partly to mostly
cloudy. 
.sunday...light and variable winds. partly sunny in the morning,
then becoming mostly cloudy. 
.sunday night...northeast winds 10 knots or less becoming east
10 to 15 knots. freezing rain with snow likely in the evening,
then freezing rain and rain overnight. 
.monday...southeast winds 15 to 25 knots becoming southwest. rain
showers, snow showers and freezing rain in the morning, then snow
and rain showers in the afternoon. 
.monday night...southwest winds 15 to 25 knots becoming west.
lake effect snow showers. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
10 knots. snow showers during the day, then a chance of snow
showers tuesday night. 
.wednesday...southwest winds 10 knots or less becoming west. lake
effect snow showers. 
.thursday...west winds 10 knots or less becoming southwest. a
chance of 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 sat dec 27 2025


slz024-280400-
saint lawrence river from ogdensburg to saint regis-
402 pm est sat dec 27 2025

.tonight...light and variable winds. mainly clear early, then
becoming mostly cloudy. 
.sunday...light and variable winds. mostly sunny early, then
becoming mostly cloudy. 
.sunday night...northeast winds 5 to 15 knots. freezing rain and
snow likely in the evening, then freezing rain overnight. 
.monday...east winds 15 to 20 knots becoming southwest and
increasing to 30 knots. freezing rain and rain showers in the
morning, then rain showers with snow showers likely with freezing
rain in the afternoon. 
.monday night...southwest winds to 30 knots becoming west 15 to
25 knots. lake effect snow showers. 
.tuesday...west winds 15 to 25 knots diminishing to 10 to
15 knots. snow showers during the day, then a chance of snow
showers tuesday night. 
.wednesday...southwest winds 5 to 15 knots becoming west. lake
effect snow showers likely. 
.thursday...west winds 10 knots or less becoming southwest. a
chance of snow showers. 

$$