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


slz022-024-051500-
saint lawrence river from cape vincent to saint regis
403 am edt tue may 5 2026

.today...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers this morning, then showers with a chance of
thunderstorms this afternoon. 
.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
402 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.


loz062-051500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt tue may 5 2026

.today...southwest winds 15 to 20 knots becoming west. a chance
of showers early. a chance of showers early this afternoon, then
showers likely late. waves 2 to 3 feet. 
.tonight...west winds 15 to 20 knots becoming southeast and
diminishing to 5 to 10 knots. showers. waves 1 to 3 feet
subsiding to 1 foot or less. 
.wednesday...east winds 5 to 10 knots becoming south. showers
likely. waves 1 foot or less. 
.wednesday night...west winds 5 to 10 knots. waves 1 foot or
less. 
.thursday...west winds 5 to 10 knots. waves 2 feet or less. 
.friday...west winds 5 to 15 knots becoming southwest. a chance
of showers friday night. waves 1 to 2 feet. 
.saturday...southwest winds 5 to 15 knots. a chance of showers.
waves 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 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.


loz063>065-051500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue may 5 2026

.today...southwest winds 15 to 20 knots becoming west. a chance
of showers 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.

$$