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


slz022-024-160900-
saint lawrence river from cape vincent to saint regis
1003 pm edt fri may 15 2026

.overnight...south winds 5 to 10 knots becoming southwest.
becoming mainly clear. 
.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
1002 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.


loz062-160900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt fri may 15 2026

.overnight...southwest winds 5 to 15 knots becoming south.
waves 1 to 2 feet. 
.saturday...south winds 5 to 15 knots becoming southwest 15 to
20 knots. a chance of showers in the afternoon. waves 1 to 3 feet
building to 3 to 5 feet. 
.saturday night...southwest winds 15 to 20 knots becoming west
5 to 15 knots. a chance of showers in the evening. waves 3 to
5 feet subsiding to 1 to 3 feet. 
.sunday...west winds 10 knots or less becoming south. waves
2 feet or less. 
.sunday night...southeast 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 2 feet or less. 
.tuesday...southwest winds 15 to 20 knots. a chance of showers
during the day, then showers likely with a chance of
thunderstorms tuesday night. waves 1 to 3 feet building to 3 to
5 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. showers likely during the day. waves 2 to 4 feet. 

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 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>065-160900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt fri may 15 2026

.overnight...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.

$$

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open lake forecast for lake erie
national weather service cleveland oh
910 pm edt fri may 15 2026

for waters beyond five nautical miles of shore on lake erie

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...
high pressure 30.10 inches shifts east of lake erie tonight. a
warm front lifts northward tonight, then will become stationary 
just north of the lake this weekend. a ridge averaging 30.00 
inches will build over the eastern great lakes into early next 
week.


lez061-166>169-160815-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
910 pm edt fri may 15 2026

.overnight...south winds 5 to 15 knots. waves 2 feet or
less. 
.saturday...south winds 10 to 15 knots becoming southwest. a
chance of showers with a slight chance of thunderstorms late in
the morning. a chance of showers and thunderstorms in the
afternoon. waves 1 to 3 feet. 
.saturday night...southwest winds 5 to 15 knots. a chance of
showers and thunderstorms in the evening. waves 1 to 3 feet. 
.sunday...southwest winds 10 knots or less becoming northeast. a
chance of showers. waves 2 feet or less. 
.sunday night...east winds 5 to 15 knots becoming south. waves
2 feet or less. 
.monday...south winds 10 to 15 knots. a chance of showers monday
night. waves 1 to 3 feet. 
.tuesday...southwest winds 10 to 15 knots. showers with a chance
of thunderstorms. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...west winds 10 to 15 knots becoming north. a chance
of showers during the day. waves 2 to 4 feet subsiding to 1 to
3 feet. 

winds and waves higher in and near thunderstorms.

$$