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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu aug 20 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 over the upper great lakes will build 
southeast across southern ontario and quebec today and tonight, 
before sliding across new england friday, then into the canadian 
maritimes saturday. an elongated 29.7 inch low will slowly make its 
way from the central great lakes to western quebec saturday and 
sunday, then will wobble about western quebec through at least 
monday.


loz062-201500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt thu aug 20 2026

.today...north winds 10 knots or less becoming south. waves
1 foot or less. 
.tonight...west winds less than 10 knots becoming north. waves
1 foot or less. 
.friday...northeast winds 10 knots or less becoming east 10 to
15 knots. waves 2 feet or less. 
.friday night...east winds 5 to 15 knots becoming southeast.
waves 2 feet or less. 
.saturday...southeast winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms. waves 1 to 2 feet. 
.sunday...west winds 10 to 15 knots. a chance of showers. waves
1 to 3 feet building to 2 to 4 feet. 
.monday...west winds 10 to 15 knots. 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.

$$

fzus61 kbuf 200802
glflo 
expires:202608201500;;037967

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu aug 20 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 over the upper great lakes will build 
southeast across southern ontario and quebec today and tonight, 
before sliding across new england friday, then into the canadian 
maritimes saturday. an elongated 29.7 inch low will slowly make its 
way from the central great lakes to western quebec saturday and 
sunday, then will wobble about western quebec through at least 
monday.


loz063>065-201500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu aug 20 2026

.today...northwest winds 10 knots or less becoming west. waves
2 feet or less. 
.tonight...west winds 10 knots or less becoming northeast. waves
1 foot or less. 
.friday...east winds 10 knots or less becoming northeast. waves
1 foot or less. 
.friday night...northeast winds 5 to 10 knots becoming southeast.
waves 2 feet or less. 
.saturday...southeast winds 5 to 15 knots becoming south. showers
with a chance of thunderstorms. waves 1 to 3 feet. 
.sunday...southwest winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers during the day, then showers likely
sunday night. waves 1 to 3 feet building to 2 to 4 feet. 
.monday...west winds 15 to 20 knots diminishing to 10 to
15 knots. showers likely during the day, then a chance of showers
monday night. waves 2 to 4 feet subsiding to 1 to 3 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
402 am edt thu aug 20 2026


slz022-024-201500-
saint lawrence river from cape vincent to saint regis
402 am edt thu aug 20 2026

.today...light and variable winds. partly sunny. 
.tonight...northwest winds less than 10 knots. partly cloudy. 
.friday...light and variable winds. sunny.
.friday night...northeast winds less than 10 knots becoming east.
mainly clear in the evening, then becoming partly cloudy. 
.saturday...southeast winds 10 knots or less. a chance of showers
during the day, then showers with a chance of thunderstorms
saturday night. 
.sunday...south winds 5 to 10 knots becoming southwest. showers
with a chance of thunderstorms. 
.monday...west winds 10 knots or less becoming southwest. showers
likely. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake erie
national weather service cleveland oh
337 am edt thu aug 20 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 builds into the region through friday.
low pressure 29.90 inches moves into the great lakes region on 
saturday with a cold front crossing late saturday night into 
sunday.


lez061-168-169-201415-
ripley to buffalo ny extending from 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-
337 am edt thu aug 20 2026

.today...east winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.tonight...northeast winds 5 to 10 knots becoming east. waves
2 feet or less. 
.friday...east winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.friday night...northeast winds 5 to 10 knots becoming south.
waves 1 foot or less. 
.saturday...south winds 5 to 15 knots becoming west. a chance of
showers and thunderstorms during the day, then showers with a
chance of thunderstorms saturday night. waves 2 feet or less. 
.sunday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of showers. waves 1 to 3 feet. 
.monday...northwest winds 5 to 15 knots becoming west. waves 1 to
2 feet. 

winds and waves higher in and near thunderstorms.

$$