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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt mon aug 31 2026


slz022-024-010900-
saint lawrence river from cape vincent to saint regis
1003 pm edt mon aug 31 2026

.overnight...light and variable winds. a chance of showers,
then showers with a chance of thunderstorms late. patchy fog
late. 
.tuesday...east winds 5 to 10 knots becoming northeast. showers
with a chance of thunderstorms early, then a chance of showers
from late morning on. 
.tuesday night...northeast winds less than 10 knots. patchy fog
overnight. 
.wednesday...southeast winds 10 knots or less becoming south. a
chance of showers in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.wednesday night...south winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms. 
.thursday...southwest winds less than 10 knots. showers likely
with a chance of thunderstorms during the day, then a chance of
showers thursday night. 
.friday...northwest winds 10 knots or less becoming north. partly
cloudy. 
.saturday...north winds 10 knots or less becoming northeast.
partly cloudy, then becoming 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
1002 pm edt mon aug 31 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 frontal boundary will remain stalled near the lake 
today through tuesday before moving northeast across the lake 
tuesday night as a warm front. a 29.8 inch low will then move from 
northwest ontario province tuesday night to western quebec by 
wednesday night before reaching northern new england and the 
canadian maritimes thursday night. a trailing cold front will move 
south across the lake thursday.


loz063>065-010900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt mon aug 31 2026

.overnight...south winds less than 10 knots. showers with a
chance of thunderstorms. patchy fog. waves 1 foot
or less. 
.tuesday...south winds 10 knots or less becoming north. patchy
fog early. showers with a chance of thunderstorms early, then a
chance of showers late in the morning. waves 1 foot or less. 
.tuesday night...northeast winds 10 knots or less becoming
southeast. waves 1 foot or less. 
.wednesday...southeast winds 5 to 15 knots. a chance of showers
in the morning, then showers likely with a chance of
thunderstorms in the afternoon. waves 2 feet or less. 
.wednesday night...southeast winds 5 to 15 knots becoming
southwest. showers with a chance of thunderstorms. waves 2 feet
or less. 
.thursday...west winds 5 to 10 knots becoming northwest. showers
with a chance of thunderstorms during the day. waves 1 to 2 feet.
.friday...northwest winds 5 to 15 knots becoming north. waves
2 feet or less. 
.saturday...north winds 10 to 15 knots becoming northeast. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$