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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt sun aug 16 2026


slz022-024-161500-
saint lawrence river from cape vincent to saint regis
402 am edt sun aug 16 2026

.today...light and variable winds. partly sunny this morning,
then becoming mostly cloudy. 
.tonight...east winds 10 knots or less becoming southwest.
showers with a chance of thunderstorms through the early
overnight, then a chance of showers late. 
.monday...southwest winds less than 10 knots becoming northwest.
a chance of showers. 
.monday night...northwest winds less than 10 knots. patchy fog
overnight. 
.tuesday...light and variable winds becoming south 5 to 10 knots.
patchy fog during the day. a chance of showers tuesday night. 
.wednesday...southwest winds 10 knots or less becoming west.
showers likely with a chance of thunderstorms during the day,
then a chance of showers and thunderstorms wednesday night. 
.thursday...light and variable winds. mainly clear. 

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 sun aug 16 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 continues to exit eastward before a warm front 
drifts northeastward across lake ontario this evening and is 
followed quickly by the eastward passage of a cold front this 
evening through tonight. behind the cold front, a trough averaging 
29.8 inches should linger over lake ontario through monday. a 30.0 
inch high should build from the upper midwest monday night and 
traverse lake ontario on tuesday. the ridge should begin to exit 
eastward tuesday night before a cold front sweeps southeastward 
across lake ontario wednesday through wednesday night. behind the 
cold front, a 30.1 inch high should build from the western great 
lakes through this thursday.


loz063>065-161500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun aug 16 2026

.today...southeast winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 
.tonight...southeast winds 15 to 20 knots becoming southwest
10 to 15 knots. a chance of showers and thunderstorms through the
early overnight, then a chance of showers late. waves 1 to
3 feet. 
.monday...west winds 5 to 10 knots becoming northwest. a chance
of showers. waves 2 feet or less. 
.monday night...west winds 10 knots or less becoming north. waves
2 feet or less. 
.tuesday...northwest winds 10 knots or less becoming southwest
10 to 15 knots. a chance of showers tuesday night. waves 2 feet
or less. 
.wednesday...west winds 5 to 15 knots becoming northwest. showers
likely with a chance of thunderstorms during the day, then a
chance of showers and thunderstorms wednesday night. waves 1 to
2 feet. 
.thursday...northwest winds 5 to 10 knots becoming west. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$