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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt fri oct 30 2026

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 30.4 inch high will settle over the lower great 
lakes tonight through saturday. this high will drift into the mid 
atlantic states sunday through monday, then drift off the east coast 
by tuesday. a 29.6 inch low is then forecast to move from the upper 
mississippi valley wednesday to the upper great lakes thursday.


loz063>065-310300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt fri oct 30 2026

.tonight...northwest winds 15 to 20 knots becoming north 10 to
15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.saturday...north winds 10 knots or less becoming west. waves
2 feet or less. 
.saturday night...west winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.sunday...south winds 5 to 10 knots. waves 1 foot or less. 
.sunday night...south winds 5 to 15 knots becoming southwest.
waves 2 feet or less. 
.monday...southwest winds 10 knots or less becoming south. waves
2 feet or less. 
.tuesday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet. 
.wednesday...south winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers. waves 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri oct 30 2026


slz022-024-310300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri oct 30 2026

.tonight...northwest winds 5 to 15 knots diminishing to less than
10 knots. partly cloudy this evening, then becoming mainly clear.
.saturday...light and variable winds. sunny.
.saturday night...southwest winds less than 10 knots. partly
cloudy. 
.sunday...southwest winds 10 knots or less. mostly sunny. 
.sunday night...southwest winds 10 knots or less. partly to
mostly cloudy. 
.monday...southwest winds 5 to 10 knots becoming light and
variable. mostly cloudy. 
.tuesday...south winds 10 knots or less. mostly cloudy. 
.wednesday...south winds 5 to 10 knots. a chance of showers
wednesday night. 

$$