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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 12 2026


slz022-024-130900-
saint lawrence river from cape vincent to saint regis
1003 pm edt tue may 12 2026

.overnight...light and variable winds. rain showers likely
late. 
.wednesday...southeast winds 5 to 15 knots becoming south.
showers through early afternoon, then showers likely late. 
.wednesday night...south winds 10 knots or less becoming
southwest. showers.
.thursday...southwest winds less than 10 knots becoming
northwest. showers.
.thursday night...north winds less than 10 knots. a chance of
showers in the evening. 
.friday...north winds 10 knots or less becoming southwest. mostly
cloudy. 
.saturday...southwest winds 5 to 15 knots becoming west. a chance
of showers. 
.sunday...west winds 5 to 10 knots becoming light and variable.
partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue may 12 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 29.6 inch low over the central great lakes tonight 
will move to a little north of lake ontario by wednesday evening, 
then will weaken into a trough over eastern new york and new england 
thursday. a 30.1 inch high will then build from the central great 
lakes and ohio valley thursday night to the lower great lakes and 
mid atlantic friday, then off the carolina coast saturday. a 29.2 
inch low over the central plains will then push its warm front into 
the lower lakes region on sunday.


loz063>065-130900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue may 12 2026

.overnight...east winds less than 10 knots becoming
southeast and increasing to 15 to 20 knots. showers. waves 1 to
3 feet. 
.wednesday...southeast winds 15 to 25 knots becoming southwest.
showers in the morning, then showers likely in the afternoon.
waves 3 to 5 feet subsiding to 2 to 4 feet. 
.wednesday night...southwest winds 5 to 15 knots. a chance of
showers. waves 1 to 3 feet. 
.thursday...southwest winds 5 to 10 knots becoming northwest.
waves 2 feet or less. 
.thursday night...northwest winds 5 to 10 knots. waves 2 feet or
less. 
.friday...northwest winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.saturday...south winds 10 to 15 knots becoming west. a chance of
showers. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 15 knots becoming southeast. waves 1 to
3 feet subsiding to 1 foot or less. 

$$