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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed sep 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 30.1 inch high will continue to build across the 
eastern seaboard, spanning across the eastern great lakes this 
afternoon. a warm front will lift across the lake thursday, followed 
by a cold front crossing the lower great lakes later thursday night 
and friday morning. a 30.3 inch high is then forecast to build into 
the western great lakes friday night and over the eastern great 
lakes by saturday, before exiting into northern new england sunday. 
meanwhile, a cold front will then cross the eastern great lakes 
sunday night, with another 30.3 inch high building from the western 
great lakes into the eastern great lakes monday and tuesday.


loz063>065-010300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt wed sep 30 2026

.tonight...southeast winds 5 to 15 knots becoming southwest. a
chance of showers late. waves 2 feet or less. 
.thursday...southwest winds 10 to 15 knots becoming south. a
chance of showers through early afternoon. waves 1 to 3 feet. 
.thursday night...southwest winds 10 to 15 knots becoming west. a
chance of showers in the evening, then showers overnight. waves
1 to 3 feet. 
.friday...west winds 10 to 15 knots increasing to 15 to 20 knots.
showers. waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...northwest winds 15 to 20 knots becoming north
10 to 15 knots. a chance of showers in the evening. waves 3 to
5 feet subsiding to 2 to 4 feet. 
.saturday...north winds 5 to 15 knots becoming southeast 10 knots
or less. waves 1 to 3 feet subsiding to 1 foot or less. 
.sunday...south winds 15 to 20 knots becoming west. waves 1 to
3 feet building to 3 to 5 feet. 
.monday...northwest winds 15 to 20 knots becoming north. waves
3 to 5 feet subsiding to 2 to 4 feet. 

$$

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


slz022-024-010300-
saint lawrence river from cape vincent to saint regis
403 pm edt wed sep 30 2026

.tonight...southwest winds 10 knots or less. mostly cloudy
through the early overnight, then becoming partly cloudy. 
.thursday...southwest winds 5 to 15 knots. a chance of showers
from late morning on. 
.thursday night...southwest winds 5 to 10 knots. showers.
.friday...west winds 5 to 10 knots becoming northwest. showers.
.friday night...northwest winds 10 knots or less. a chance of
showers in the evening. 
.saturday...north winds less than 10 knots. mainly clear. 
.sunday...south winds 5 to 10 knots becoming west. a chance of
rain showers sunday night. 
.monday...northwest winds 10 knots or less. a chance of rain
showers during the day. 

$$