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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt wed may 20 2026


slz022-024-201500-
saint lawrence river from cape vincent to saint regis
403 am edt wed may 20 2026

.today...west winds 5 to 15 knots. mostly cloudy early, then
becoming mostly sunny. 
.tonight...northwest winds 5 to 10 knots becoming north. mainly
clear early, then becoming partly cloudy. 
.thursday...north winds 10 knots or less. sunny.
.thursday night...north winds less than 10 knots. mainly clear in
the evening, then becoming partly cloudy. 
.friday...east winds less than 10 knots. partly cloudy, then
becoming mostly cloudy. 
.saturday...east winds 5 to 10 knots becoming southeast. a chance
of showers during the day, then showers likely saturday night. 
.sunday...southeast winds 5 to 10 knots becoming south. showers
likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed may 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...behind a passing cold front this morning, a large 30.4 
inch area of surface high pressure will build across the entire 
great lakes region through thursday, before sliding east off the new 
england coast late friday. this surface high will then strengthen to 
30.6 inches as it anchors over atlantic canada through sunday. a 
29.9 inch low and attendant warm front will then slowly approach the 
lake late friday night and saturday, before weakening and sliding 
eastward sunday. a 30.1 inch high will settle across the region 
monday.


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

.today...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...northwest winds 10 to 15 knots becoming north. waves
1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming southeast.
waves 2 feet or less. 
.thursday night...east winds less than 10 knots. waves 1 foot or
less. 
.friday...east winds 15 to 20 knots. showers likely friday night.
waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...east winds to 30 knots becoming southeast and
diminishing to 15 to 20 knots. showers. waves 5 to 8 feet
subsiding to 3 to 6 feet. waves occasionally around 10 feet. 
.sunday...southeast winds 15 to 20 knots diminishing to 5 to
15 knots. showers likely. waves 2 to 4 feet subsiding to 1 to
3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed may 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...behind a passing cold front this morning, a large 30.4 
inch area of surface high pressure will build across the entire 
great lakes region through thursday, before sliding east off the new 
england coast late friday. this surface high will then strengthen to 
30.6 inches as it anchors over atlantic canada through sunday. a 
29.9 inch low and attendant warm front will then slowly approach the 
lake late friday night and saturday, before weakening and sliding 
eastward sunday. a 30.1 inch high will settle across the region 
monday.


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

.today...west winds 15 to 20 knots. waves 3 to 6 feet. 
.tonight...west winds 15 to 20 knots becoming north. waves 3 to
6 feet subsiding to 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots becoming northwest
5 to 15 knots. waves 1 to 3 feet. 
.thursday night...west winds less than 10 knots. waves 1 foot or
less. 
.friday...east winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of showers friday night. waves 1 to 3 feet. 
.saturday...southeast winds 15 to 25 knots. showers. waves 3 to
5 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet.
waves occasionally around 9 feet. 
.sunday...southeast winds 15 to 25 knots. showers likely. waves
3 to 5 feet subsiding to 1 to 3 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
338 am edt wed may 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...
a cold front exits to the southeast this morning. high pressure
30.40 inches slides across the northern great lakes tonight and
thursday before shifting into new england on friday. low pressure
30.00 inches approaches from the southwest friday night into
saturday, lifting a warm front across the lake early saturday. a
weak cold front is expected to cross the lake on sunday. 


lez061-169-201415-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
338 am edt wed may 20 2026

.today...northwest winds 5 to 15 knots becoming west. a slight
chance of showers this morning. waves 1 to 3 feet. 
.tonight...northwest winds 5 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.thursday night...northeast winds 15 to 20 knots becoming east.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northeast winds 10 to 15 knots becoming east 15 to
20 knots. a chance of rain during the day, then rain friday
night. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. rain with a chance of thunderstorms during the day,
then showers likely saturday night. waves 1 to 3 feet. 
.sunday...south winds 10 knots or less. a chance of showers
during the day, then showers likely sunday night. waves 2 feet or
less. 

winds and waves higher in and near thunderstorms.

$$