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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt wed apr 15 2026


slz022-024-160300-
saint lawrence river from cape vincent to saint regis
404 pm edt wed apr 15 2026

.tonight...east winds less than 10 knots. a chance of showers
through the early overnight, then showers likely late. 
.thursday...southeast winds 10 knots or less becoming south.
showers likely in the morning, then showers in the afternoon. 
.thursday night...south winds 10 knots or less becoming
northwest. showers with a chance of thunderstorms in the evening,
then showers likely overnight. 
.friday...north winds 10 knots or less. a chance of showers in
the morning. 
.friday night...northeast winds less than 10 knots. mainly clear
in the evening, then becoming partly cloudy. 
.saturday...southeast winds 5 to 10 knots becoming southwest
10 to 15 knots. a chance of showers during the day, then showers
saturday night. 
.sunday...southwest winds 10 to 15 knots becoming west. rain
showers likely during the day, then a chance of rain showers
sunday night. 
.monday...northwest winds 5 to 10 knots becoming southwest.
mostly cloudy, then clearing. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 152003
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt wed apr 15 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 will move into the central great lakes 
tonight before reaching southern quebec thursday night, then drift 
off the new england coast by friday night. a 30.0 inch high is then 
forecast to build from the central great lakes friday to the lower 
great lakes saturday morning, then off the east coast saturday 
night. a 29.3 inch surface low to the north of lake superior 
saturday will deepen to 28.9 inches by sunday, with a trailing cold 
front crossing the lake saturday night. a 30.4 inch surface high 
will push from the plains to the upper ohio valley from sunday 
through monday.


loz062-160300-
lake ontario open waters from the niagara river to hamlin beach-
403 pm edt wed apr 15 2026

.tonight...southwest winds 10 to 15 knots. a chance of showers
and thunderstorms this evening, then showers with a chance of
thunderstorms after midnight. waves 1 to 3 feet. 
.thursday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers in the morning, then showers likely
in the afternoon. waves 1 to 3 feet. 
.thursday night...southwest winds 15 to 20 knots becoming west
and diminishing to around 10 knots. showers likely in the
evening, then a chance of showers overnight. waves 1 to 3 feet. 
.friday...northwest winds 10 knots or less becoming southeast. a
chance of showers in the morning. waves 2 feet or less. 
.friday night...east winds 10 knots or less. waves 1 foot or
less. 
.saturday...southeast winds 10 to 15 knots becoming west 15 to
20 knots. showers likely. waves 2 feet or less building to 3 to
6 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. a chance
of rain and snow showers during the day, then a chance of rain
showers sunday night. waves 5 to 8 feet. waves occasionally
around 10 feet. 
.monday...northwest winds 15 to 25 knots becoming southwest and
diminishing to 10 to 15 knots. waves 4 to 7 feet subsiding to
2 to 3 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 152003
glflo 
expires:202604160300;;424696

open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt wed apr 15 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 will move into the central great lakes 
tonight before reaching southern quebec thursday night, then drift 
off the new england coast by friday night. a 30.0 inch high is then 
forecast to build from the central great lakes friday to the lower 
great lakes saturday morning, then off the east coast saturday 
night. a 29.3 inch surface low to the north of lake superior 
saturday will deepen to 28.9 inches by sunday, with a trailing cold 
front crossing the lake saturday night. a 30.4 inch surface high 
will push from the plains to the upper ohio valley from sunday 
through monday.


loz063>065-160300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt wed apr 15 2026

.tonight...south winds 5 to 10 knots. a chance of showers through
the early overnight, then showers likely late. waves 2 feet or
less. 
.thursday...south winds 5 to 10 knots becoming southwest.
showers. waves 2 feet or less. 
.thursday night...southwest winds 5 to 10 knots becoming west.
showers in the evening, then showers likely overnight. waves
2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming west. a chance
of showers in the morning. waves 2 feet or less. 
.friday night...northwest winds 10 knots or less becoming
southeast. waves 1 foot or less. 
.saturday...southeast winds 15 to 25 knots becoming southwest.
showers likely. waves 1 to 3 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.sunday...west winds to 30 knots becoming northwest. rain showers
likely during the day, then a chance of rain and snow showers
sunday night. waves 5 to 9 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 
.monday...northwest winds 15 to 25 knots becoming west. waves
5 to 9 feet subsiding to 3 to 5 feet. waves occasionally around
11 feet. 

winds and waves higher in and near thunderstorms.

$$