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


slz022-024-151500-
saint lawrence river from cape vincent to saint regis
410 am edt wed apr 15 2026

.today...east winds 10 knots or less becoming north. a chance of
rain showers early, then rain showers late this morning. rain
showers likely early this afternoon. areas of fog this morning.
patchy fog late. 
.tonight...northeast winds less than 10 knots becoming east.
areas of fog. a chance of showers in the evening, then showers
likely after midnight. 
.thursday...east winds 10 knots or less becoming south. patchy
fog in the morning. showers likely in the morning, then showers
in the afternoon. 
.thursday night...south winds less than 10 knots becoming north.
showers with a chance of thunderstorms in the evening, then
showers likely overnight. 
.friday...north winds 10 knots or less becoming east. showers
likely during the day. 
.saturday...southeast winds 5 to 15 knots becoming southwest. a
chance of showers during the day, then showers likely saturday
night. 
.sunday...southwest winds 10 to 15 knots becoming west. rain
showers likely during the day, then rain showers likely with a
chance of snow showers sunday night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am 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 weaken to around 29.8 as it slides 
east across the lake early this morning. another 29.6 inch low will 
move into the central great lakes wednesday night 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.


loz062-151500-
lake ontario open waters from the niagara river to hamlin beach-
409 am edt wed apr 15 2026

.today...southeast winds 5 to 15 knots becoming southwest. patchy
fog. showers with a chance of thunderstorms early, then a chance
of showers from late morning on. waves 1 to 3 feet. 
.tonight...southwest winds 10 to 15 knots becoming south. patchy
fog. a chance of showers in the evening. showers likely late.
waves 1 to 3 feet. 
.thursday...south winds 10 to 15 knots becoming southwest. patchy
fog. showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 1 to 3 feet. 
.thursday night...southwest winds 10 to 15 knots becoming west.
patchy fog in the evening. showers in the evening, then showers
likely overnight. waves 1 to 3 feet. 
.friday...northwest winds 10 knots or less becoming southeast. a
chance of showers during the day. waves 1 foot or less. 
.saturday...southeast winds 5 to 10 knots becoming west and
increasing to 15 to 20 knots. showers likely. waves 1 foot or
less building to 3 to 6 feet. 
.sunday...west winds 20 to 25 knots becoming northwest. a chance
of rain showers. waves 5 to 8 feet. waves occasionally around
10 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 am 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 weaken to around 29.8 as it slides 
east across the lake early this morning. another 29.6 inch low will 
move into the central great lakes wednesday night 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.


loz063>065-151500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 am edt wed apr 15 2026

.today...east winds 5 to 10 knots becoming west. showers with a
chance of thunderstorms this morning. patchy fog. waves 2 feet or
less. 
.tonight...south winds 5 to 10 knots. patchy fog. 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. patchy
fog. showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 1 to 2 feet. 
.thursday night...southwest winds 5 to 10 knots becoming west.
patchy fog in the evening. showers with a chance of thunderstorms
in the evening, then showers likely overnight. waves 1 to 2 feet.
.friday...northwest winds 10 knots or less becoming southeast. a
chance of showers during the day. waves 1 foot or less. 
.saturday...southeast winds 5 to 15 knots becoming southwest and
increasing to 15 to 25 knots. showers likely. waves 1 foot or
less building to 4 to 7 feet. waves occasionally around 9 feet. 
.sunday...west winds to 30 knots. a chance of rain showers. waves
5 to 9 feet building to 7 to 10 feet. waves occasionally around
13 feet. 

winds and waves higher in and near thunderstorms.

$$