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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt wed aug 19 2026


slz022-024-191500-
saint lawrence river from cape vincent to saint regis
403 am edt wed aug 19 2026

.today...southwest winds 5 to 10 knots. showers likely early,
then showers with a chance of thunderstorms from late morning on.
.tonight...southwest winds 10 knots or less becoming west. a
chance of showers early. 
.thursday...light and variable winds becoming west 5 to 10 knots.
partly to mostly sunny. 
.thursday night...west winds 5 to 10 knots becoming light and
variable. becoming mainly clear. 
.friday...light and variable winds. mainly clear, then becoming
partly cloudy. 
.saturday...southeast winds 5 to 10 knots becoming south. showers
saturday night. 
.sunday...south winds 5 to 10 knots becoming southwest. showers
with a chance of thunderstorms. 

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 wed aug 19 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 cold front will cross the lake today. behind the 
front, high pressure averaging 30.1 inches will build from the upper 
great lakes thursday to new england by friday night. the high will 
then move into the canadian maritimes saturday, while an elongated 
29.7 inch low slowly makes its way from the central great lakes to 
western quebec saturday and sunday.


loz063>065-191500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed aug 19 2026

.today...southwest winds 10 to 15 knots becoming west. showers
likely early, then showers likely with a chance of thunderstorms.
a chance of showers and thunderstorms late. waves 1 to 3 feet. 
.tonight...west winds 5 to 10 knots becoming northwest. waves
1 to 2 feet. 
.thursday...northwest winds 10 knots or less becoming west. waves
2 feet or less. 
.thursday night...west winds 10 knots or less becoming north.
waves 1 foot or less. 
.friday...northeast winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.saturday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. a chance of showers and thunderstorms during the day,
then showers with a chance of thunderstorms saturday night. waves
1 to 3 feet. 
.sunday...southwest winds 15 to 20 knots becoming west. showers
with a chance of thunderstorms during the day, then a chance of
showers and thunderstorms sunday night. waves 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$