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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue sep 29 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 29.8 inch low along the southern shores of cape cod 
will northeast along the new england coast today while filling to 
29.9 inches. this low will finally dissipate over the north atlantic 
wednesday as a 30.1 inch high builds to just off the mid atlantic 
coast. a cold front over the upper great lakes wednesday night will 
cross the lower great lakes thursday night. a 30.4 inch high is then 
forecast to build into the upper great lakes friday and the lower 
great lakes by saturday, before exiting into northern maine sunday.


loz063>065-292100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt tue sep 29 2026

.this afternoon...northeast winds 10 knots or less becoming south.
waves 1 foot or less. 
.tonight...light and variable winds becoming south 5 to 10 knots.
waves 1 foot or less. 
.wednesday...south winds 5 to 10 knots. waves 2 feet or less. 
.wednesday night...south winds 5 to 15 knots. waves 2 feet or
less. 
.thursday...south winds 15 to 20 knots becoming west 10 to
15 knots. showers likely thursday night. waves 1 to 3 feet. 
.friday...northwest winds 5 to 15 knots becoming north. showers
likely during the day, then a chance of showers friday night.
waves 1 to 3 feet. 
.saturday...northeast winds 5 to 15 knots becoming southeast. a
chance of showers saturday night. 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
1003 am edt tue sep 29 2026


slz022-024-292100-
saint lawrence river from cape vincent to saint regis
1003 am edt tue sep 29 2026

.rest of today...northeast winds less than 10 knots. mostly
cloudy late this morning, then becoming mostly sunny. 
.tonight...light and variable winds. areas of fog after midnight.
.wednesday...south winds 10 knots or less becoming southwest.
areas of fog in the morning. 
.wednesday night...southwest winds 10 knots or less becoming
south. mostly cloudy. 
.thursday...south winds 5 to 15 knots becoming southwest. a
chance of showers during the day, then showers likely thursday
night. 
.friday...west winds less than 10 knots becoming northwest.
showers likely during the day, then a chance of showers friday
night. 
.saturday...north winds less than 10 knots becoming east. mainly
clear, then becoming partly cloudy. 

$$