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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1241 pm edt tue may 5 2026


slz022-024-052115-
saint lawrence river from cape vincent to saint regis
1241 pm edt tue may 5 2026

...small craft advisory in effect until 8 pm edt this evening...

.this afternoon...southwest winds 15 to 25 knots. showers with a 
chance of thunderstorms early, then a chance of showers and 
thunderstorms late. 
.tonight...west winds 15 to 20 knots becoming southwest and
diminishing to 10 knots or less after midnight. showers in the
evening, then showers likely after midnight. 
.wednesday...southwest winds less than 10 knots becoming west.
showers likely. 
.wednesday night...southwest winds less than 10 knots. a chance
of rain showers in the evening. 
.thursday...southwest winds 10 knots or less becoming west.
partly to mostly cloudy. 
.friday...west winds 10 knots or less becoming southwest. a
chance of rain showers. 
.saturday...south winds 5 to 10 knots becoming southwest. showers
likely. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue may 5 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 29.1 inch low over hudson bay today will weaken to 
29.3 inches as it moves to northern quebec through wednesday. a 
trailing wavy cold front will slowly cross the lake late this 
afternoon, then drift across new england wednesday and out to sea 
thursday. a 30.1 inch high over the tennessee and ohio valleys 
thursday night will slide to the mid-atlantic coastline friday. a 
29.6 inch low will track across the lake early saturday, followed by 
a 29.7 inch low that will track near or just south of the lake for 
later sunday.


loz063>065-052100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt tue may 5 2026

.rest of today...southwest winds 15 to 20 knots becoming west. a
chance of showers late this morning, then a chance of showers and
thunderstorms early this afternoon. showers likely with a chance
of thunderstorms late. waves 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming southeast and
diminishing to 10 knots or less after midnight. showers with a
chance of thunderstorms early, then showers from late evening on.
waves 1 to 3 feet. 
.wednesday...east winds 5 to 10 knots becoming northwest.
showers. waves 1 foot or less. 
.wednesday night...west winds 5 to 10 knots. a chance of showers
in the evening. waves 2 feet or less. 
.thursday...west winds 5 to 15 knots. waves 1 to 2 feet. 
.friday...west winds 5 to 15 knots becoming south. a chance of
showers friday night. waves 1 to 3 feet. 
.saturday...south winds 5 to 15 knots becoming southwest. showers
likely. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$