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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri may 15 2026


slz022-024-160300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri may 15 2026

.tonight...southwest winds 5 to 10 knots. mostly cloudy early,
then clearing. 
.saturday...southwest winds 5 to 15 knots. a chance of showers
late. 
.saturday night...southwest winds 5 to 15 knots. a chance of
showers. 
.sunday...west winds 5 to 10 knots. mostly sunny. 
.sunday night...northwest winds less than 10 knots. partly
cloudy. 
.monday...southeast winds 10 knots or less becoming southwest.
becoming mainly clear. 
.tuesday...southwest winds 5 to 15 knots. a chance of showers
during the day, then showers likely tuesday night. 
.wednesday...southwest winds 5 to 15 knots becoming west. showers
likely during the day, then a chance of showers wednesday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt fri may 15 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 30.1 inch high will slide off the carolina coast 
tonight. a 29.1 inch low well to the north over hudson bay will 
swing a warm front across the lower great lakes tomorrow, with an 
attendant cold front approaching and stalling near the lake saturday 
night. a 29.4 inch low over the central plains on sunday will weaken 
to 29.7 inches as it moves northeast into the upper great lakes 
sunday night while swinging an attendant warm front across the lake. 
another area of low pressure will develop over the central plains 
monday. the low will weaken from 29.4 inches to 29.6 inches as it 
tracks northeast to the upper great lakes monday night into tuesday 
morning, then to near the southern tip of james bay on tuesday. a 
cold front from this low will cross the lake wednesday.


loz063>065-160300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri may 15 2026

.tonight...southwest winds 5 to 10 knots becoming south. waves
1 to 2 feet. 
.saturday...south winds 5 to 15 knots becoming southwest. a
chance of showers early in the afternoon. showers likely with a
chance of thunderstorms late. waves 2 feet or less. 
.saturday night...southwest winds 5 to 15 knots becoming west. a
chance of showers and thunderstorms in the evening, then a chance
of showers overnight. waves 2 to 4 feet subsiding to 1 to 3 feet.
.sunday...west winds 5 to 10 knots. waves 2 feet or less. 
.sunday night...south winds 10 knots or less becoming east. waves
1 foot or less. 
.monday...southeast winds 10 to 15 knots becoming south. waves
2 feet or less. 
.tuesday...southwest winds 10 to 15 knots. a chance of showers
and thunderstorms during the day, then showers likely with a
chance of thunderstorms tuesday night. waves 1 to 3 feet building
to 2 to 4 feet. 
.wednesday...southwest winds 10 to 15 knots becoming west.
showers likely during the day. waves 2 to 4 feet building to 3 to
5 feet, then subsiding to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$