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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sat jun 13 2026


slz022-024-140900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sat jun 13 2026

.overnight...southwest winds 5 to 10 knots. a chance of
showers and thunderstorms. 
.sunday...southwest winds 5 to 10 knots becoming west. a chance
of showers early, then showers. showers with a chance of
thunderstorms late. some thunderstorms may produce gusty winds
from late morning on. 
.sunday night...west winds 5 to 10 knots. showers with a chance
of thunderstorms in the evening, then a chance of showers
overnight. some thunderstorms may produce gusty winds in the
evening. 
.monday...southwest winds 5 to 15 knots. partly to mostly sunny. 
.monday night...southwest winds 5 to 10 knots. partly cloudy. 
.tuesday...southwest winds 5 to 10 knots becoming south. partly
cloudy. 
.wednesday...south winds 5 to 10 knots. showers likely. 
.thursday...south winds 15 to 20 knots becoming southwest.
showers.

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat jun 13 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 30.0 inch high will ridge across the lower great lakes 
through sunday morning, then a cold front will cross the region 
sunday afternoon and evening. the eastern edge of a 30.1 inch high 
over the plains states will push over the lake on monday with a 
trough averaging 29.8 inches crossing the lake on tuesday. a 29.4 
inch low will then track north of the lake on wednesday, with its 
trailing cold front approaching the lake late in the day on 
wednesday. a second 29.4 inch surface low will pass across the upper 
great lakes thursday, with a warm front, followed by a cold front to 
sweep across the lake throughout the day.


loz062-140900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt sat jun 13 2026

.overnight...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers early, then showers with a chance of
thunderstorms from late morning on. some thunderstorms may
produce gusty winds from late morning on. waves 1 to 2 feet. 
.sunday night...northwest winds 10 to 15 knots becoming west
15 to 20 knots. showers likely in the evening. waves 1 to 3 feet
building to 2 to 4 feet. 
.monday...west winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 2 to 4 feet. 
.monday night...southwest winds 10 to 15 knots. waves 1 to
3 feet. 
.tuesday...southwest winds 5 to 15 knots becoming south. a chance
of showers tuesday night. waves 1 to 2 feet. 
.wednesday...south winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers during the day, then showers likely
with a chance of thunderstorms wednesday night. waves 1 to
3 feet. 
.thursday...south winds to 30 knots becoming west. showers with a
chance of thunderstorms during the day, then a chance of showers
thursday night. waves 5 to 8 feet building to 6 to 10 feet, then
subsiding to 5 to 8 feet. waves occasionally around 13 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat jun 13 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 30.0 inch high will ridge across the lower great lakes 
through sunday morning, then a cold front will cross the region 
sunday afternoon and evening. the eastern edge of a 30.1 inch high 
over the plains states will push over the lake on monday with a 
trough averaging 29.8 inches crossing the lake on tuesday. a 29.4 
inch low will then track north of the lake on wednesday, with its 
trailing cold front approaching the lake late in the day on 
wednesday. a second 29.4 inch surface low will pass across the upper 
great lakes thursday, with a warm front, followed by a cold front to 
sweep across the lake throughout the day.


loz063>065-140900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat jun 13 2026

.overnight...southwest winds 10 to 15 knots. waves 1 to
2 feet. 
.sunday...southwest winds 5 to 15 knots becoming west. a chance
of showers late in the morning. showers with a chance of
thunderstorms in the afternoon. some thunderstorms may produce
gusty winds in the afternoon. waves 2 feet or less. 
.sunday night...west winds 10 to 15 knots increasing to 15 to
20 knots. showers with a chance of thunderstorms in the evening.
some thunderstorms may produce gusty winds in the evening. waves
1 to 2 feet building to 3 to 6 feet. 
.monday...west winds 15 to 20 knots. waves 3 to 6 feet subsiding
to 2 to 4 feet. 
.monday night...southwest winds 5 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.tuesday...southwest winds 5 to 15 knots becoming south. waves
2 feet or less. 
.wednesday...south winds 5 to 15 knots increasing to 15 to
20 knots. a chance of showers during the day, then showers likely
wednesday night. waves 2 feet or less building to 2 to 4 feet. 
.thursday...south winds to 30 knots becoming west. showers with a
chance of thunderstorms. waves 4 to 7 feet building to 6 to
10 feet. waves occasionally around 13 feet. 

winds and waves higher in and near thunderstorms.

$$