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open lake forecast for lake ontario
national weather service buffalo ny
402 pm est thu nov 6 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 30.2 inch high will slide east off the mid-atlantic 
coast tonight. a 29.4 inch low over the upper great lakes tonight 
will then slowly deepen to 29.3 inches as it makes its way to 
western and central quebec friday and friday night, with its 
trailing cold front crossing the lake friday night. another 29.8 
inch surface low will deepen to 29.6 inches as it tracks from the 
ohio valley to new england sunday and monday, then strengthen 
further while moving into east-central quebec by tuesday.


loz063>065-070400-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm est thu nov 6 2025

.tonight...west winds 15 to 20 knots becoming south. waves 3 to
5 feet subsiding to 1 to 3 feet. 
.friday...south winds 15 to 25 knots increasing to 30 knots. a
chance of showers late in the morning. showers in the afternoon.
waves 3 to 5 feet building to 6 to 9 feet. waves occasionally
around 11 feet. 
.friday night...southwest winds to 30 knots becoming west 15 to
25 knots. showers. waves 5 to 8 feet. waves occasionally around
10 feet. 
.saturday...west winds 15 to 25 knots becoming northwest and
diminishing to around 10 knots. showers likely in the morning,
then a chance of showers in the afternoon. waves 5 to 8 feet
subsiding to 2 to 4 feet. waves occasionally around 10 feet. 
.saturday night...northwest winds 5 to 15 knots becoming east. a
chance of rain showers in the evening, then rain showers likely
overnight. waves 1 to 3 feet. 
.sunday...east winds 15 to 25 knots becoming northwest. rain
showers during the day, then rain showers with snow showers
likely sunday night. waves 3 to 6 feet building to 4 to 7 feet,
then subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.monday...northwest winds 15 to 25 knots becoming west to
30 knots. snow and rain showers likely during the day, then snow
showers monday night. waves 3 to 6 feet building to 6 to 9 feet.
waves occasionally around 11 feet. 
.tuesday...west winds to 30 knots becoming southwest. snow
showers with rain showers likely during the day, then rain
showers tuesday night. waves 8 to 11 feet building to 9 to
13 feet, then subsiding to 8 to 11 feet. waves occasionally
around 16 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est thu nov 6 2025


slz022-070400-
saint lawrence river from cape vincent to ogdensburg-
402 pm est thu nov 6 2025

.tonight...west winds 10 knots or less becoming south. partly
cloudy this evening, then becoming mostly cloudy. 
.friday...south winds 10 to 15 knots increasing to 15 to
20 knots. rain showers in the afternoon. 
.friday night...south winds 15 to 20 knots becoming west 10 to
15 knots. showers.
.saturday...west winds 10 knots or less becoming northwest. rain
showers likely in the morning, then a chance of rain showers in
the afternoon. 
.saturday night...north winds less than 10 knots becoming
northeast. a chance of rain and snow showers overnight. 
.sunday...northeast winds 5 to 15 knots becoming northwest. rain
and snow showers. 
.monday...northwest winds 5 to 10 knots becoming west. snow
showers likely. 
.tuesday...west winds 10 to 15 knots becoming southwest. snow
showers likely with a chance of rain showers during the day, then
rain showers likely with a chance of snow showers tuesday night. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm est thu nov 6 2025


slz024-070400-
saint lawrence river from ogdensburg to saint regis-
402 pm est thu nov 6 2025

.tonight...west winds less than 10 knots. partly cloudy through
the early overnight, then becoming mostly cloudy. 
.friday...south winds 5 to 15 knots. rain showers in the
afternoon. 
.friday night...south winds 10 to 15 knots becoming southwest.
showers.
.saturday...west winds 5 to 15 knots becoming northwest less than
10 knots. rain showers in the morning, then a chance of rain
showers in the afternoon. 
.saturday night...light and variable winds. a chance of snow
showers overnight. 
.sunday...northeast winds 5 to 10 knots becoming northwest. rain
and snow showers. 
.monday...northwest winds 5 to 10 knots becoming west. snow and
rain showers likely during the day, then snow showers likely
monday night. 
.tuesday...west winds 5 to 15 knots becoming southwest. snow
showers likely during the day, then snow and rain showers likely
tuesday night. 

$$