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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue oct 13 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 cold front will sweep southeast across the lake on 
today. behind the cold front, a ridge averaging 30.2 inches builds 
from northern ontario through thursday. a low averaging 29.5 inches 
may move across the great lakes region friday. there is uncertainty 
in the track of this low, with the potential of deepening as it 
crosses the region. a 30.5 inch high will build into the great lakes 
region saturday through sunday.


loz062-131500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt tue oct 13 2026

.today...south winds 5 to 15 knots becoming southwest 15 to
20 knots. showers with a chance of thunderstorms this morning,
then a chance of showers this afternoon. waves 1 to 3 feet. 
.tonight...southwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 feet. 
.wednesday...west winds 10 to 15 knots becoming northwest. waves
1 to 3 feet. 
.wednesday night...northwest winds 10 to 15 knots becoming
northeast. waves 1 to 3 feet. 
.thursday...northeast winds 10 to 15 knots becoming east. showers
thursday night. waves 1 to 3 feet. 
.friday...west winds 15 to 25 knots becoming northwest to
30 knots. showers. waves 3 to 5 feet building to 8 to 11 feet.
waves occasionally around 14 feet. 
.saturday...northwest winds to 30 knots becoming west 15 to
25 knots. waves 7 to 10 feet subsiding to 3 to 6 feet. waves
occasionally around 13 feet. 

winds and waves higher in and near thunderstorms.

$$

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glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue oct 13 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 cold front will sweep southeast across the lake on 
today. behind the cold front, a ridge averaging 30.2 inches builds 
from northern ontario through thursday. a low averaging 29.5 inches 
may move across the great lakes region friday. there is uncertainty 
in the track of this low, with the potential of deepening as it 
crosses the region. a 30.5 inch high will build into the great lakes 
region saturday through sunday.


loz063>065-131500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue oct 13 2026

.today...south winds 5 to 15 knots. showers through early
afternoon, then showers likely with a chance of thunderstorms
late. waves 2 feet or less. 
.tonight...southwest winds 10 to 15 knots becoming west. showers
likely with a chance of thunderstorms early, then a chance of
showers and thunderstorms late in the evening. waves 1 to 3 feet
building to 2 to 4 feet. 
.wednesday...northwest winds 10 to 15 knots becoming west. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday night...northwest winds 10 to 15 knots becoming north
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...northeast winds 5 to 15 knots becoming southeast.
showers thursday night. waves 2 to 4 feet subsiding to 2 feet or
less. 
.friday...southwest winds 15 to 25 knots becoming northwest and
increasing to 35 knot gales. showers. waves 3 to 5 feet building
to 9 to 13 feet. waves occasionally around 16 feet. 
.saturday...northwest gales to 35 knots becoming west and
diminishing to 15 to 20 knots. a chance of rain showers during
the day. waves 10 to 13 feet subsiding to 4 to 7 feet. waves
occasionally around 16 feet. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt tue oct 13 2026


slz022-024-131500-
saint lawrence river from cape vincent to saint regis
403 am edt tue oct 13 2026

.today...northeast winds 5 to 15 knots diminishing to less than
10 knots. showers with a chance of thunderstorms. 
.tonight...northeast winds less than 10 knots becoming west.
showers with a chance of thunderstorms in the evening, then a
chance of showers after midnight. 
.wednesday...west winds 10 knots or less. mostly cloudy. 
.wednesday night...northwest winds 5 to 10 knots becoming north.
mostly cloudy. 
.thursday...north winds 10 knots or less becoming east. rain
showers likely thursday night. 
.friday...southeast winds 5 to 15 knots becoming northwest 15 to
20 knots. rain showers. 
.saturday...northwest winds 15 to 20 knots becoming west and
diminishing to less than 10 knots. a chance of rain showers
during the day. 

winds and waves higher in and near thunderstorms.

$$