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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt thu may 7 2026


slz022-024-080900-
saint lawrence river from cape vincent to saint regis
1003 pm edt thu may 7 2026

.overnight...southwest winds 10 knots or less becoming
west. partly cloudy. 
.friday...west winds 10 knots or less becoming southwest 10 to
15 knots. partly sunny. 
.friday night...southwest winds 10 knots or less becoming south.
partly cloudy. 
.saturday...south winds 5 to 10 knots. mostly sunny. 
.saturday night...south winds 5 to 15 knots becoming southwest.
showers likely. 
.sunday...southwest winds 5 to 15 knots becoming west less than
10 knots. a chance of rain showers during the day. 
.monday...west winds 10 knots or less becoming northwest. a
chance of rain showers. 
.tuesday...northwest winds less than 10 knots. partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu may 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 broad area of high pressure averaging 29.8 inches will 
build from the ohio valley tonight to off the mid atlantic coast by 
friday night. a 29.5 inch low will then move from the upper great 
lakes saturday to central quebec sunday before weakening over 
northern quebec monday. a 30.3 inch high is then forecast to build 
from northwest ontario province monday to the central great lakes 
tuesday.


loz062-080900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt thu may 7 2026

.rest of tonight...west winds 10 knots or less. a chance of rain
showers late this evening. waves 1 foot or less. 
.friday...west winds 5 to 10 knots becoming south. waves 1 foot
or less. 
.friday night...south winds 5 to 10 knots. waves 2 feet or less. 
.saturday...south winds 5 to 15 knots. a chance of showers in the
afternoon. waves 2 feet or less. 
.saturday night...south winds 10 to 15 knots becoming west. a
chance of showers. waves 1 to 3 feet. 
.sunday...west winds 5 to 15 knots becoming northwest. waves 1 to
3 feet. 
.monday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.tuesday...northwest winds 5 to 10 knots becoming southeast. a
chance of showers tuesday night. waves 1 foot or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu may 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 broad area of high pressure averaging 29.8 inches will 
build from the ohio valley tonight to off the mid atlantic coast by 
friday night. a 29.5 inch low will then move from the upper great 
lakes saturday to central quebec sunday before weakening over 
northern quebec monday. a 30.3 inch high is then forecast to build 
from northwest ontario province monday to the central great lakes 
tuesday.


loz063>065-080900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt thu may 7 2026

.rest of tonight...west winds 5 to 10 knots. a chance of showers.
waves 2 feet or less. 
.friday...west winds 5 to 15 knots becoming southwest. waves
2 feet or less. 
.friday night...south winds 5 to 10 knots. waves 2 feet or less. 
.saturday...south winds 5 to 15 knots becoming southeast. a
chance of showers in the afternoon. waves 2 feet or less. 
.saturday night...south winds 10 to 15 knots becoming west 15 to
20 knots. showers likely. waves 1 to 3 feet building to 2 to
4 feet. 
.sunday...west winds 15 to 20 knots becoming northwest 5 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 foot or less. 
.monday...northwest winds 5 to 15 knots. waves 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots becoming south. waves
2 feet or less. 

$$