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open lake forecast for lake ontario
national weather service buffalo ny
402 am est wed nov 5 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...low pressure over the upper great lakes will deepen 
to 29.5 inches and pass along or just north of the north shore of 
the lake today, then will make its way across new england tonight 
while further strengthening to 29.1 inches. in its wake, a 30.3 inch 
high will build from the ohio valley to mid-atlantic states 
thursday, then will slide out to sea through friday while allowing a 
29.4 inch low to track from the upper great lakes to quebec and push 
its trailing cold front across the lake friday night. another 29.7 
inch surface low will then track from the ohio valley to new england 
sunday and monday while deepening to 29.5 inches.


loz062-051600-
lake ontario open waters from the niagara river to hamlin beach-
402 am est wed nov 5 2025

...gale warning in effect from 1 pm est this afternoon through
late tonight...

.today...south winds 15 to 25 knots becoming west and increasing
to 35 knot gales this afternoon. a chance of showers early, then
showers from late morning on. waves 1 to 2 feet building to 9 to
12 feet. waves occasionally around 15 feet. 
.tonight...northwest gales to 35 knots diminishing to 30 knots.
showers through the early overnight, then a chance of showers
late. waves 10 to 14 feet subsiding to 7 to 11 feet. waves
occasionally around 18 feet. 
.thursday...northwest winds 15 to 25 knots becoming west. waves
5 to 8 feet subsiding to 2 to 4 feet. waves occasionally around
10 feet. 
.thursday night...west winds 10 to 15 knots becoming south. waves
1 to 3 feet. 
.friday...south winds 15 to 25 knots becoming west. showers.
waves 3 to 6 feet. 
.saturday...northwest winds 15 to 20 knots becoming northeast
10 to 15 knots. a chance of showers during the day, then showers
likely saturday night. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.sunday...northeast winds 15 to 20 knots becoming northwest. rain
showers likely during the day, then rain showers likely with a
chance of snow showers sunday night. waves 3 to 5 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am est wed nov 5 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...low pressure over the upper great lakes will deepen 
to 29.5 inches and pass along or just north of the north shore of 
the lake today, then will make its way across new england tonight 
while further strengthening to 29.1 inches. in its wake, a 30.3 inch 
high will build from the ohio valley to mid-atlantic states 
thursday, then will slide out to sea through friday while allowing a 
29.4 inch low to track from the upper great lakes to quebec and push 
its trailing cold front across the lake friday night. another 29.7 
inch surface low will then track from the ohio valley to new england 
sunday and monday while deepening to 29.5 inches.


loz063>065-051600-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am est wed nov 5 2025

...gale warning in effect from 1 pm est this afternoon through
late tonight...

.today...south winds 10 to 15 knots becoming southwest and
increasing to 35 knot gales this afternoon. a chance of showers
late this morning. showers this afternoon. waves 1 to 3 feet
building to 9 to 12 feet. waves occasionally around 15 feet. 
.tonight...west gales to 40 knots becoming northwest and
diminishing to 30 knots after midnight. rain showers through the
early overnight, then a chance of rain showers late. waves 12 to
17 feet subsiding to 9 to 12 feet. waves occasionally around
22 feet. 
.thursday...northwest winds 15 to 25 knots becoming west. waves
7 to 10 feet subsiding to 3 to 6 feet. waves occasionally around
13 feet. 
.thursday night...west winds 15 to 20 knots becoming south. waves
3 to 5 feet subsiding to 1 to 3 feet. 
.friday...south winds to 30 knots becoming west 15 to 25 knots.
showers. waves 5 to 8 feet subsiding to 3 to 6 feet. waves
occasionally around 10 feet. 
.saturday...northwest winds 15 to 20 knots becoming east 5 to
15 knots. rain showers likely. waves 3 to 6 feet subsiding to
1 to 3 feet. 
.sunday...east winds 15 to 20 knots becoming northwest. rain
showers during the day, then rain showers with snow showers
likely sunday night. waves 2 to 4 feet building to 3 to 6 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am est wed nov 5 2025


slz022-051600-
saint lawrence river from cape vincent to ogdensburg-
402 am est wed nov 5 2025

...small craft advisory in effect from 4 pm est this afternoon
through late tonight...

.today...south winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of rain showers early, then rain showers from late
morning on. 
.tonight...northwest winds 15 to 25 knots. rain showers in the
evening, then a chance of rain showers after midnight. a chance
of rain and snow showers late. 
.thursday...northwest winds 5 to 15 knots becoming west. mostly
sunny. 
.thursday night...west winds 10 knots or less becoming south.
partly cloudy in the evening, then becoming mostly cloudy. 
.friday...south winds 10 to 15 knots becoming southwest. rain
showers. 
.saturday...northwest winds 10 knots or less becoming northeast.
rain showers during the day, then a chance of rain showers
saturday night. 
.sunday...northeast winds 5 to 10 knots becoming west. rain and
snow showers. 

$$