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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt tue may 5 2026


slz022-024-060900-
saint lawrence river from cape vincent to saint regis
1003 pm edt tue may 5 2026

.overnight...southwest winds 10 knots or less becoming
south. rain likely, then showers late. 
.wednesday...south winds less than 10 knots becoming southwest.
showers in the morning, then a chance of showers early in the
afternoon. 
.wednesday night...southwest winds 10 knots or less. mostly
cloudy. 
.thursday...southwest winds 10 knots or less. mostly sunny. 
.thursday night...southwest winds 5 to 10 knots. partly to mostly
cloudy. 
.friday...southwest winds 5 to 10 knots becoming south. a chance
of rain showers. 
.saturday...south winds 5 to 10 knots becoming southwest. a
chance of showers. 
.sunday...southwest winds 10 knots or less becoming west. a
chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue may 5 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 29.2 inch low over hudson bay this evening will weaken 
to 29.3 inches as it moves to northern quebec through wednesday. a 
trailing wavy cold front will slowly cross the lake through tonight, 
then drift across new england wednesday and out to sea thursday. a 
30.1 inch high over the tennessee and ohio valleys thursday night 
will slide to the mid-atlantic coastline friday. a 29.6 inch low 
will track across the lake early saturday, followed by a 29.7 inch 
low that will track near or just south of the lake for later sunday.


loz062-060900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt tue may 5 2026

.overnight...south winds 5 to 10 knots becoming east. rain,
then showers late. waves 1 to 3 feet. 
.wednesday...east winds 10 knots or less becoming southwest.
showers early, then a chance of showers late in the morning.
waves 1 foot or less. 
.wednesday night...west winds 5 to 10 knots becoming northwest.
waves 1 foot or less. 
.thursday...west winds 5 to 10 knots. waves 1 foot or less. 
.thursday night...west winds 5 to 10 knots. waves around 1 foot. 
.friday...west winds 5 to 10 knots becoming southwest. a chance
of showers friday night. waves 1 to 2 feet. 
.saturday...southwest winds 5 to 15 knots. a chance of showers.
waves 1 to 2 feet. 
.sunday...southwest winds 5 to 10 knots becoming northwest. a
chance of showers. waves 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue may 5 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 29.2 inch low over hudson bay this evening will weaken 
to 29.3 inches as it moves to northern quebec through wednesday. a 
trailing wavy cold front will slowly cross the lake through tonight, 
then drift across new england wednesday and out to sea thursday. a 
30.1 inch high over the tennessee and ohio valleys thursday night 
will slide to the mid-atlantic coastline friday. a 29.6 inch low 
will track across the lake early saturday, followed by a 29.7 inch 
low that will track near or just south of the lake for later sunday.


loz063>065-060900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue may 5 2026

.overnight...southwest winds 10 knots or less becoming
southeast. rain. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday...northeast winds 5 to 10 knots becoming west. rain
early, then showers likely late in the morning. waves 2 feet or
less. 
.wednesday night...west winds 5 to 10 knots. waves 2 feet or
less. 
.thursday...west winds 5 to 15 knots. waves 1 to 2 feet. 
.thursday night...west winds 10 to 15 knots. waves 1 to 2 feet. 
.friday...west winds 5 to 15 knots becoming south. a chance of
showers friday night. waves 2 feet or less. 
.saturday...south winds 5 to 15 knots becoming southwest. a
chance of showers. waves 1 to 2 feet. 
.sunday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers. waves 1 to 2 feet. 

$$