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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sat oct 18 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 developing area of low pressure at 29.6 inches this 
evening over the mid- mississippi valley will reach lower michigan 
by tomorrow morning while deepening to 29.4 inches. this low will 
continue to move north to james bay through tomorrow night while 
deepening to 29.2 inches, with a trailing cold front crossing the 
lake sunday night. another 29.5 inch low will develop along the 
frontal boundary monday over eastern new york, with this low moving 
north into quebec by tuesday and weakening to 29.6 inches. another 
29.4 inch low will then move into the upper great lakes tuesday 
night and wednesday before consolidating with the low over central 
quebec by thursday. this low will exit to the northeast over 
northern quebec friday, with a weak, 30.2 inch area of high pressure 
advancing across the upper ohio valley southern mid-atlantic friday.


loz063>065-190300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sat oct 18 2025

.tonight...southeast winds 15 to 20 knots becoming south. waves
1 to 3 feet building to 3 to 5 feet. 
.sunday...southeast winds 15 to 25 knots. waves 3 to 6 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.sunday night...south winds 15 to 25 knots becoming west.
showers. waves 4 to 7 feet subsiding to 3 to 6 feet. waves
occasionally around 9 feet. 
.monday...west winds 15 to 25 knots increasing to 30 knots.
showers. waves 4 to 7 feet building to 9 to 13 feet. waves
occasionally around 16 feet. 
.monday night...west winds to 30 knots diminishing to 15 to
25 knots. showers likely in the evening, then a chance of showers
overnight. waves 10 to 13 feet subsiding to 3 to 6 feet. waves
occasionally around 16 feet. 
.tuesday...southwest winds 15 to 20 knots. showers. waves 3 to
5 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west.
showers. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.thursday...west winds 15 to 25 knots. showers. waves 5 to 9 feet
subsiding to 3 to 6 feet. waves occasionally around 11 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 pm edt sat oct 18 2025


slz022-024-190300-
saint lawrence river from cape vincent to saint regis
402 pm edt sat oct 18 2025

.tonight...southeast winds 10 knots or less. mostly cloudy. 
.sunday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. mostly sunny. 
.sunday night...south winds 15 to 20 knots becoming southeast
5 to 15 knots. showers.
.monday...northeast winds 5 to 15 knots becoming west. showers.
.monday night...west winds 5 to 15 knots. showers.
.tuesday...southwest winds 5 to 10 knots becoming south. a chance
of showers during the day, then showers tuesday night. 
.wednesday...south winds 5 to 10 knots becoming southwest.
showers.
.thursday...southwest winds 10 knots or less becoming west. rain
showers. 

$$