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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1012 pm edt fri apr 3 2026


slz022-024-040900-
saint lawrence river from cape vincent to saint regis
1012 pm edt fri apr 3 2026

.overnight...west winds 5 to 15 knots becoming north.
partly to mostly cloudy. 
.saturday...northeast winds 5 to 15 knots. a chance of rain
showers early in the afternoon. rain showers likely late. 
.saturday night...east winds 10 to 15 knots becoming south 15 to
20 knots. showers.
.sunday...southwest winds 15 to 20 knots. showers in the morning,
then a chance of showers in the afternoon. 
.sunday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of snow showers overnight. 
.monday...west winds 5 to 15 knots becoming north. a chance of
snow showers. 
.tuesday...north winds 10 knots or less becoming west. a chance
of snow showers during the day. 
.wednesday...southwest winds 5 to 15 knots becoming south 15 to
20 knots. partly to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 pm edt fri apr 3 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 30.6 inch high will ridge south across the lake as it 
slides east from lower hudson bay to central quebec tonight. a 29.4 
inch surface low will track through the central great lakes 
saturday, then into quebec saturday night and sunday, while dragging 
a strong cold front across the lake saturday night, with a secondary 
cold front then following sunday night and monday. a 30.5 inch high 
will then build across the great lakes tuesday and tuesday night, 
before sliding east and off the new england coast wednesday.


loz062-040900-
lake ontario open waters from the niagara river to hamlin beach-
1010 pm edt fri apr 3 2026

.overnight...northwest winds 5 to 15 knots becoming north.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.saturday...east winds 10 to 15 knots increasing to 15 to
25 knots. a chance of rain showers from late morning on. waves
1 to 2 feet building to 3 to 6 feet. 
.saturday night...east winds 15 to 20 knots becoming southwest.
showers. waves 3 to 5 feet. 
.sunday...west winds 15 to 25 knots. rain showers likely in the
morning. waves 3 to 6 feet building to 5 to 8 feet. waves
occasionally around 10 feet. 
.sunday night...west winds 15 to 25 knots. waves 5 to 8 feet.
waves occasionally around 10 feet. 
.monday...west winds 15 to 25 knots becoming northwest. a chance
of rain and snow showers monday night. waves 3 to 6 feet
subsiding to 3 to 5 feet. 
.tuesday...northwest winds 15 to 25 knots diminishing to 5 to
15 knots. a chance of snow showers during the day. waves 3 to
6 feet subsiding to 1 to 3 feet. 
.wednesday...south winds 5 to 10 knots increasing to 30 knots.
waves 1 to 3 feet building to 4 to 7 feet. waves occasionally
around 9 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 pm edt fri apr 3 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 30.6 inch high will ridge south across the lake as it 
slides east from lower hudson bay to central quebec tonight. a 29.4 
inch surface low will track through the central great lakes 
saturday, then into quebec saturday night and sunday, while dragging 
a strong cold front across the lake saturday night, with a secondary 
cold front then following sunday night and monday. a 30.5 inch high 
will then build across the great lakes tuesday and tuesday night, 
before sliding east and off the new england coast wednesday.


loz063>065-040900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 pm edt fri apr 3 2026

.overnight...northwest winds 5 to 15 knots becoming north.
waves 3 to 5 feet subsiding to 1 to 3 feet. 
.saturday...northeast winds 10 to 15 knots becoming east 15 to
20 knots. a chance of rain showers early in the afternoon. rain
showers likely late. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday night...east winds 15 to 25 knots becoming southwest to
30 knots. showers. waves 2 to 4 feet building to 5 to 8 feet.
waves occasionally around 10 feet. 
.sunday...west winds 15 to 25 knots increasing to 30 knots. rain
showers in the morning, then a chance of rain showers in the
afternoon. waves 3 to 6 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 
.sunday night...west winds to 30 knots. waves 6 to 10 feet. waves
occasionally around 13 feet. 
.monday...west winds 15 to 25 knots. a chance of snow and rain
showers monday night. waves 5 to 8 feet subsiding to 3 to 6 feet.
waves occasionally around 10 feet. 
.tuesday...northwest winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of snow showers during the day. waves 4 to
7 feet subsiding to 1 to 3 feet. waves occasionally around
9 feet. 
.wednesday...south winds 5 to 10 knots increasing to 30 knots.
waves 1 to 2 feet building to 6 to 9 feet. waves occasionally
around 11 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
339 am edt sat apr 4 2026

for waters beyond five nautical miles of shore on lake erie

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 warm front will move north across the lake this morning as low
pressure 29.60 inches moves northeast through the great lakes
dragging a cold front through late this evening. a trough
averaging 30.00 inches will linger over lake erie through monday.
high pressure 30.50 will build across the region for tuesday into
wednesday. 


lez061-168-169-041415-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
339 am edt sat apr 4 2026

.today...northeast winds 5 to 15 knots becoming southeast. a
chance of rain showers with a slight chance of thunderstorms this
morning, then a slight chance of rain showers and thunderstorms
early this afternoon. a chance of rain showers and thunderstorms
late. waves 1 to 3 feet. 
.tonight...south winds 10 to 15 knots becoming west. showers with
a chance of thunderstorms in the evening, then showers after
midnight. waves 1 to 3 feet building to 2 to 4 feet. 
.sunday...west winds 15 to 20 knots. waves 2 to 4 feet building
to 3 to 6 feet. 
.sunday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of snow showers overnight. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.monday...west winds 10 to 15 knots becoming northwest 15 to
20 knots. a chance of rain showers during the day, then a chance
of rain and snow showers monday night. waves 1 to 3 feet building
to 3 to 5 feet. 
.tuesday...northwest winds 15 to 20 knots becoming south and
diminishing to less than 10 knots. waves 3 to 5 feet subsiding to
1 foot or less. 
.wednesday...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 25 knots. waves 2 feet or less building to
3 to 5 feet. 

winds and waves higher in and near thunderstorms.

$$