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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt thu jun 18 2026


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
402 am edt thu jun 18 2026

...small craft advisory in effect from 8 am edt this morning
through this evening...

.today...southeast winds 15 to 25 knots becoming southwest.
showers with a chance of thunderstorms through early afternoon,
then a chance of showers and thunderstorms late. 
.tonight...southwest winds 15 to 20 knots. a chance of showers in
the evening. 
.friday...southwest winds 15 to 20 knots becoming west. a chance
of showers in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.friday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. showers with a chance of thunderstorms in the evening,
then a chance of showers overnight. 
.saturday...west winds 10 knots or less. showers likely with a
chance of thunderstorms. 
.sunday...west winds less than 10 knots. a chance of showers. 
.monday...light and variable winds. a chance of showers. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu jun 18 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...an unseasonably strong low over southern ontario this 
morning will track to southern quebec this afternoon, deepening to 
29.1 inches. the trailing cold front will move across the lake 
today. this low will move slowly east to the canadian maritimes 
friday while filling to 29.4 inches, eventually moving east of 
newfoundland by saturday night. a weak ridge of high pressure 
averaging 29.9 inches will then build into the great lakes saturday 
night through sunday. a 29.7 inch low is then forecast to move over 
or just south of the lower great lakes monday before moving off the 
new england coast by tuesday.


loz062-181500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt thu jun 18 2026

.today...southwest winds 15 to 25 knots becoming west. showers
early, then a chance of showers. waves 3 to 5 feet building to
5 to 8 feet. waves occasionally around 10 feet. 
.tonight...west winds 15 to 25 knots. waves 5 to 8 feet subsiding
to 3 to 6 feet. waves occasionally around 10 feet. 
.friday...west winds 15 to 25 knots. waves 3 to 6 feet. 
.friday night...west winds 15 to 20 knots. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.saturday...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...west winds 10 knots or less becoming east. a chance of
showers sunday night. waves 1 foot or less. 
.monday...northeast winds 5 to 15 knots becoming northwest. a
chance of showers during the day. waves 2 feet or less. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu jun 18 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...an unseasonably strong low over southern ontario this 
morning will track to southern quebec this afternoon, deepening to 
29.1 inches. the trailing cold front will move across the lake 
today. this low will move slowly east to the canadian maritimes 
friday while filling to 29.4 inches, eventually moving east of 
newfoundland by saturday night. a weak ridge of high pressure 
averaging 29.9 inches will then build into the great lakes saturday 
night through sunday. a 29.7 inch low is then forecast to move over 
or just south of the lower great lakes monday before moving off the 
new england coast by tuesday.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu jun 18 2026

.today...south winds to 30 knots becoming west. showers with a
chance of thunderstorms this morning, then a chance of showers
this afternoon. waves 5 to 9 feet. waves occasionally around
11 feet. 
.tonight...west winds to 30 knots. waves 6 to 9 feet. waves
occasionally around 11 feet. 
.friday...west winds 20 to 25 knots. waves 6 to 9 feet. waves
occasionally around 11 feet. 
.friday night...west winds 15 to 25 knots. waves 5 to 9 feet
subsiding to 4 to 7 feet. waves occasionally around 11 feet. 
.saturday...west winds 15 to 20 knots diminishing to 5 to
10 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.sunday...west winds 10 knots or less becoming south. a chance of
showers sunday night. waves 2 feet or less. 
.monday...east winds 5 to 10 knots becoming northwest. a chance
of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
344 am edt thu jun 18 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 cold front moves east of the area this morning. a surface 
trough averaging 29.60 inches lingers across the lake through 
saturday with high pressure 30.00 inches building overhead on 
sunday. low pressure 29.80 inches impacts the region for the start
of next week.


lez061-169-181415-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
344 am edt thu jun 18 2026

...gale warning in effect through this afternoon...

.today...southwest winds to 30 knots becoming west gales to 35 
knots.. a chance of showers with a slight chance of thunderstorms 
early, then a slight chance of showers and thunderstorms from late
morning on. waves 7 to 10 feet building to 9 to 13 feet. waves 
occasionally around 16 feet. 
.tonight...west winds 15 to 25 knots diminishing to 10 to
15 knots. a slight chance of showers and thunderstorms early,
then a slight chance of showers late in the evening. waves 7 to
10 feet subsiding to 3 to 5 feet. waves occasionally around
13 feet. 
.friday...west winds 10 to 15 knots increasing to 15 to 20 knots.
waves 2 to 4 feet. 
.friday night...west winds 15 to 20 knots becoming northwest and
diminishing to around 10 knots. waves 2 to 4 feet subsiding to
1 to 2 feet. 
.saturday...west winds 5 to 15 knots diminishing to less than
10 knots. waves 1 to 2 feet. 
.sunday...northwest winds 10 knots or less becoming east. a
chance of showers sunday night. waves 1 foot or less. 
.monday...northeast winds 5 to 15 knots becoming north. a chance
of showers during the day. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$