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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
411 am edt mon may 18 2026


slz022-024-181500-
saint lawrence river from cape vincent to saint regis
411 am edt mon may 18 2026

.today...east winds 5 to 10 knots becoming southwest. a chance of
showers this morning. 
.tonight...southwest winds 5 to 10 knots. a chance of showers
after midnight. 
.tuesday...southwest winds 5 to 15 knots increasing to 15 to
20 knots. a chance of showers in the morning. 
.tuesday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. showers likely with a chance of thunderstorms in
the evening, then showers likely overnight. 
.wednesday...west winds 5 to 15 knots becoming north. a chance of
showers during the day. 
.thursday...north winds 5 to 10 knots becoming light and
variable. mainly clear. 
.friday...light and variable winds. a chance of showers friday
night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
410 am edt mon may 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 area of low pressure will develop over the central 
plains today. the low will weaken from 29.4 inches to 29.6 inches as 
it tracks northeast to the upper great lakes tonight into tuesday 
morning, then to central quebec wednesday while strengthening to 
29.4 inches. a cold front attendant to this low will cross the lake 
late tuesday night into wednesday morning. a large 30.4 inch high 
will then build across the entire great lakes region wednesday night 
through thursday. high pressure will move to the east and weaken to 
30.1 inches friday.


loz062-181500-
lake ontario open waters from the niagara river to hamlin beach-
410 am edt mon may 18 2026

.today...south winds 5 to 15 knots becoming southwest 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers after midnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots. waves 1 to 3 feet
building to 3 to 6 feet. 
.tuesday night...southwest winds 15 to 25 knots becoming west.
showers with a chance of thunderstorms in the evening, then
showers overnight. waves 3 to 6 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.thursday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.friday...east winds 10 to 15 knots. a chance of showers friday
night. waves 2 feet or less building to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
410 am edt mon may 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 area of low pressure will develop over the central 
plains today. the low will weaken from 29.4 inches to 29.6 inches as 
it tracks northeast to the upper great lakes tonight into tuesday 
morning, then to central quebec wednesday while strengthening to 
29.4 inches. a cold front attendant to this low will cross the lake 
late tuesday night into wednesday morning. a large 30.4 inch high 
will then build across the entire great lakes region wednesday night 
through thursday. high pressure will move to the east and weaken to 
30.1 inches friday.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
410 am edt mon may 18 2026

.today...south winds 5 to 15 knots. waves 2 feet or less. 
.tonight...south winds 5 to 10 knots becoming southwest. a chance
of showers late in the evening. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots. waves 1 to 3 feet
building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms. waves 2 to 4 feet
building to 3 to 5 feet. 
.wednesday...west winds 15 to 25 knots becoming northwest.
showers likely during the day. waves 3 to 5 feet building to 4 to
7 feet, then subsiding to 3 to 5 feet. waves occasionally around
9 feet. 
.thursday...north winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...east winds 5 to 15 knots becoming southeast. a chance
of showers friday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$