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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt wed oct 7 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 cold front will sweep eastward across the lake this 
evening through early thursday morning. behind the front, a weak 
trough averaging 29.7 inches should linger over the lake through 
thursday. during thursday night through friday, a ridge averaging 
30.1 inches should affect the lake as the parent high pressure 
center moves from the western great lakes toward the central 
appalachians. a warm front should sweep northward across the lake 
friday night as the ridge begins to exit eastward. on saturday 
through monday, a weak trough averaging 29.9 inches should 
overspread the eastern great lakes generally from the south as 
isaias and its eventual remnant low approaches from the north-
central gulf coast and eventually the mid ohio valley and vicinity.


loz063>065-080300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt wed oct 7 2026

.tonight...southwest winds 15 to 20 knots becoming west. a chance
of showers early, then showers. a chance of showers late. waves
2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to
4 feet. 
.thursday...west winds 15 to 20 knots. a chance of waterspouts. a
chance of showers. waves 3 to 6 feet. 
.thursday night...west winds 15 to 20 knots. a chance of
waterspouts. a chance of showers. waves 3 to 6 feet. 
.friday...west winds 15 to 20 knots. a chance of waterspouts. a
chance of showers. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.friday night...west winds 5 to 15 knots becoming south. a chance
of waterspouts in the evening. waves 2 to 4 feet subsiding to
1 to 3 feet. 
.saturday...south winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 
.sunday...south winds 15 to 20 knots diminishing to 10 to
15 knots. showers. waves 1 to 3 feet. 
.monday...southwest winds 5 to 15 knots becoming northwest 15 to
20 knots. a chance of showers monday night. waves 1 to 3 feet
building to 3 to 5 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 oct 7 2026


slz022-024-080300-
saint lawrence river from cape vincent to saint regis
403 pm edt wed oct 7 2026

.tonight...southwest winds 5 to 15 knots. a chance of showers
early, then showers late this evening. a chance of showers after
midnight. 
.thursday...southwest winds 5 to 15 knots becoming west. showers
likely early. a chance of showers in the afternoon. 
.thursday night...west winds 5 to 10 knots. partly cloudy. 
.friday...west winds 5 to 10 knots. mostly sunny. 
.friday night...west winds 10 knots or less becoming south.
becoming mainly clear. 
.saturday...south winds less than 10 knots increasing to 10 to
15 knots. partly cloudy. 
.sunday...southwest winds 5 to 15 knots. showers likely. 
.monday...southwest winds 10 knots or less becoming northwest. a
chance of showers monday night. 

$$