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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt fri may 15 2026


slz022-024-152100-
saint lawrence river from cape vincent to saint regis
1003 am edt fri may 15 2026

.rest of today...north winds 10 knots or less becoming west.
mostly cloudy late this morning, then becoming partly sunny. 
.tonight...southwest winds 5 to 10 knots. mostly cloudy early,
then clearing. 
.saturday...southwest winds 5 to 15 knots. sunny in the morning,
then becoming partly sunny. 
.saturday night...southwest winds 5 to 10 knots. mostly cloudy. 
.sunday...west winds 5 to 10 knots becoming light and variable.
mainly clear, then becoming partly cloudy. 
.monday...southeast winds 5 to 10 knots becoming southwest. a
chance of showers monday night. 
.tuesday...southwest winds 5 to 15 knots. a chance of showers
during the day, then showers likely tuesday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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 southeast from the ohio 
valley to the carolinas today, then off the carolina coast tonight. 
a 29.1 inch low well to the north over hudson bay will swing a warm 
front into the lower great lakes on saturday, with an attendant cold 
front approaching then stalling just north of 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.


loz062-152100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt fri may 15 2026

.this afternoon...west winds 5 to 15 knots becoming southwest.
waves 1 foot or less. 
.tonight...southwest winds 10 to 15 knots. waves 1 to 2 feet. 
.saturday...south winds 5 to 15 knots becoming southwest. a
chance of showers in the afternoon. waves 1 to 3 feet. 
.saturday night...southwest winds 5 to 15 knots becoming west. a
chance of showers in the evening. waves 1 to 3 feet. 
.sunday...west winds 10 knots or less becoming east. waves 1 foot
or less. 
.monday...southeast winds 5 to 15 knots becoming southwest. a
chance of showers monday night. waves 1 foot or less building to
1 to 3 feet. 
.tuesday...southwest winds 15 to 20 knots. a chance of showers
during the day, then showers likely tuesday night. waves 1 to
3 feet building to 3 to 5 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am 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 southeast from the ohio 
valley to the carolinas today, then off the carolina coast tonight. 
a 29.1 inch low well to the north over hudson bay will swing a warm 
front into the lower great lakes on saturday, with an attendant cold 
front approaching then stalling just north of 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.


loz063>065-152100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt fri may 15 2026

.this afternoon...northwest winds 5 to 10 knots becoming west.
waves 2 feet or less. 
.tonight...southwest winds 5 to 15 knots becoming south. waves
1 to 2 feet. 
.saturday...south winds 5 to 15 knots becoming southwest. a
chance of showers in the afternoon. waves 1 to 2 feet. 
.saturday night...southwest winds 5 to 15 knots becoming west. a
chance of showers. waves 1 to 3 feet. 
.sunday...west winds 10 knots or less becoming southeast. waves
2 feet or less. 
.monday...southeast winds 5 to 15 knots becoming south. waves
2 feet or less. 
.tuesday...southwest winds 5 to 15 knots increasing to 15 to
20 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. 

winds and waves higher in and near thunderstorms.

$$