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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1002 pm edt thu aug 13 2026


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

.overnight...light and variable winds. areas of fog.

.friday...light and variable winds becoming north 5 to 10 knots.
patchy fog early. 
.friday night...north winds less than 10 knots. mainly clear. 
.saturday...north winds less than 10 knots. sunny.
.saturday night...light and variable winds. mainly clear in the
evening, then becoming partly cloudy. 
.sunday...southeast winds 10 knots or less becoming north.
showers likely. 
.monday...north winds less than 10 knots. partly cloudy, then
becoming mainly clear. 
.tuesday...light and variable winds. mainly clear, then becoming
partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu aug 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 high pressure ridge averaging 30.2 inches begins to build from the 
canadian prairies tonight before settling over lake ontario and 
vicinity by this saturday. the ridge begins to exit eastward 
saturday night through sunday morning and allows a warm front to 
sweep northeastward across lake ontario as a low of 29.7 inches 
moves eastward across the northern great lakes. this low should move 
generally east-southeastward from near the northern great lakes to 
near the gulf of maine later sunday through this monday. the low 
track should allow a cold front to sweep eastward across lake 
ontario sunday evening through sunday night. behind the cold front, 
a high pressure ridge averaging 30.0 inches should attempt to build 
from the upper midwest through monday. the high is expected to move 
off the east coast tuesday.


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

.overnight...northwest winds 10 knots or less becoming
north. waves 1 foot or less. 
.friday...north winds 10 knots or less becoming east. waves
1 foot or less. 
.friday night...east winds 10 knots or less. waves 1 foot or
less. 
.saturday...east winds 5 to 15 knots. waves 1 to 2 feet. 
.saturday night...east winds 10 to 15 knots becoming southeast. a
chance of showers overnight. waves 1 to 2 feet. 
.sunday...southeast winds around 10 knots becoming northwest.
showers likely with a chance of thunderstorms. waves 1 to 2 feet.
.monday...north winds 10 knots or less becoming northwest. waves
1 foot or less. 
.tuesday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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glflo 
expires:202608140900;;148166

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt thu aug 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 high pressure ridge averaging 30.2 inches begins to build from the 
canadian prairies tonight before settling over lake ontario and 
vicinity by this saturday. the ridge begins to exit eastward 
saturday night through sunday morning and allows a warm front to 
sweep northeastward across lake ontario as a low of 29.7 inches 
moves eastward across the northern great lakes. this low should move 
generally east-southeastward from near the northern great lakes to 
near the gulf of maine later sunday through this monday. the low 
track should allow a cold front to sweep eastward across lake 
ontario sunday evening through sunday night. behind the cold front, 
a high pressure ridge averaging 30.0 inches should attempt to build 
from the upper midwest through monday. the high is expected to move 
off the east coast tuesday.


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

.overnight...northwest winds 10 knots or less becoming
north. waves 2 feet or less. 
.friday...northeast winds 10 knots or less. waves 1 foot or less.
.friday night...northeast winds 10 knots or less. waves 1 foot or
less. 
.saturday...northeast winds 5 to 10 knots. waves 1 foot or less. 
.saturday night...east winds 5 to 10 knots becoming southeast. a
chance of showers overnight. waves 2 feet or less. 
.sunday...southeast winds 10 to 15 knots becoming north. showers
likely with a chance of thunderstorms. waves 2 feet or less. 
.monday...north winds 10 knots or less becoming northwest. a
chance of showers during the day. waves 2 feet or less. 
.tuesday...west winds 10 knots or less becoming southwest. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$