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


slz022-024-040300-
saint lawrence river from cape vincent to saint regis
411 pm edt fri apr 3 2026

.tonight...west winds 15 to 20 knots becoming north 5 to
15 knots. 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
410 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 29.6 inch low will track across southern quebec today, 
pushing a weak cold front across the lake this afternoon. 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.


loz062-040300-
lake ontario open waters from the niagara river to hamlin beach-
410 pm edt fri apr 3 2026

.tonight...west winds 15 to 20 knots becoming north 5 to
15 knots. waves 3 to 5 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
410 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 29.6 inch low will track across southern quebec today, 
pushing a weak cold front across the lake this afternoon. 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>065-040300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
410 pm edt fri apr 3 2026

.tonight...west winds 15 to 20 knots becoming north and
diminishing to 5 to 10 knots. 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
955 pm edt fri apr 3 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...
low pressure 29.50 inches moving northeast through the upper great 
lakes will first lift a warm front north across the area saturday 
morning, followed by a cold front saturday evening. a trough 
averaging 30.00 inches will linger through monday. high pressure 
30.50 inches will build across the region for tuesday into
wednesday.


lez061-168-169-040815-
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-
955 pm edt fri apr 3 2026

.overnight...northwest winds 5 to 10 knots becoming
northeast. a chance of rain showers with a slight chance of
thunderstorms late. waves 1 to 3 feet. 
.saturday...east winds 5 to 15 knots. a chance of rain showers
with a slight chance of thunderstorms in the morning, then a
slight chance of rain showers and thunderstorms early in the
afternoon. a chance of thunderstorms with a slight chance of rain
showers late. waves 2 feet or less. 
.saturday night...southwest winds 10 to 15 knots becoming west.
rain showers with a chance of thunderstorms in the evening, then
rain showers overnight. waves 1 to 3 feet building to 2 to
4 feet. 
.sunday...west winds 15 to 20 knots. rain showers likely in the
morning. 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. waves 3 to 6 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 snow and rain showers monday night. waves 1 to 2 feet building
to 2 to 4 feet. 
.tuesday...northwest winds 15 to 20 knots becoming southeast and
diminishing to less than 10 knots. waves 2 to 4 feet subsiding to
2 feet 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.

$$