• CLASSIC IWINDSURF
    Classic myiWindsurfClassic Wind & Weather maps and graphs
Hello Guest
 • 

Classic iWindsurf
kiter? see iKitesurf.com
Grab the iWindsurf Mobile App & Sign On to the New iWindsurf Website
Hi guest · Get your free membership now · Log In ·
Lake Ontario

Real-Time Data
 > Dynamic Map
 > Wind Obs Summary

Computer Forecasts
 > Model Tables

More Maps

Other Resources

Watches/Warnings
>None Active

New iWindsurf: Select your region for wind observations & forecasts:
North America | Europe | South America | Australia & Oceania | Asia | Africa

fzus61 kbuf 310456
glflo 
expires:202512311015;;531068

open lake forecast for lake ontario
national weather service buffalo ny
1156 pm est tue dec 30 2025

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...low pressure averaging 29.0 inches over georgian bay 
will move to northern new england and southern quebec today, then to 
the canadian maritimes by tuesday while deepening to 28.8 inches. a 
trough averaging 29.7 inches, will drop southward across the lake 
thursday and linger through friday.


loz063>065-311015-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1156 pm est tue dec 30 2025

.rest of tonight...west winds to 30 knots. lake effect snow.
waves 10 to 14 feet. waves occasionally around 18 feet. 
.wednesday...west winds 15 to 25 knots. lake effect snow. waves
7 to 10 feet subsiding to 5 to 8 feet. waves occasionally around
13 feet. 
.wednesday night...northwest winds 15 to 20 knots. lake effect
snow in the evening, then lake effect snow showers likely
overnight. waves 5 to 8 feet. waves occasionally around 10 feet. 
.thursday...northwest winds 15 to 25 knots becoming west. lake
effect snow showers. waves 5 to 8 feet. waves occasionally around
10 feet. 
.thursday night...west winds 15 to 25 knots. lake effect snow
showers. waves 6 to 9 feet. waves occasionally around 11 feet. 
.friday...west winds 15 to 25 knots becoming northwest. lake
effect snow showers. waves 5 to 9 feet. waves occasionally around
11 feet. 
.saturday...northwest winds 15 to 20 knots becoming north 10 to
15 knots. a chance of snow showers. waves 3 to 5 feet subsiding
to 1 to 3 feet. 
.sunday...northwest winds 10 to 15 knots becoming southwest. a
chance of snow showers. waves 1 to 3 feet. 

$$
fzus61 kbuf 310456
glfsl 
expires:202512311015;;531056

forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1156 pm est tue dec 30 2025


slz022-024-311015-
saint lawrence river from cape vincent to saint regis
1156 pm est tue dec 30 2025

.overnight...west winds 5 to 15 knots. mostly cloudy. 
.wednesday...west winds 5 to 15 knots becoming southwest. a
chance of snow showers late. 
.wednesday night...west winds 10 knots or less becoming
northwest. lake effect snow showers likely in the evening, then a
chance of snow showers overnight. 
.thursday...west winds 5 to 10 knots becoming southwest. mostly
sunny. 
.thursday night...southwest winds less than 10 knots. partly
cloudy in the evening, then becoming mostly cloudy. 
.friday...southwest winds 10 knots or less becoming northwest. a
chance of snow showers. 
.saturday...northwest winds 10 knots or less. partly cloudy. 
.sunday...west winds less than 10 knots becoming south. a chance
of snow showers. 

$$
fzus61 kbuf 310302
glflo 
expires:202512311000;;527436

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm est tue dec 30 2025

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...low pressure averaging 29.0 inches over georgian bay 
will move to northern new england and southern quebec today, then to 
the canadian maritimes by tuesday while deepening to 28.8 inches. a 
trough averaging 29.7 inches, will drop southward across the lake 
thursday and linger through friday.


loz065-311000-
lake ontario open waters from mexico bay to the saint lawrence
river-
1002 pm est tue dec 30 2025

...gale warning in effect until midnight est tonight...

.overnight...west gales to 35 knots diminishing to
30 knots. a chance of lake effect snow showers.
waves 9 to 13 feet subsiding to 7 to 10 feet. waves occasionally
around 16 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest. lake
effect snow showers likely. waves 5 to 8 feet subsiding to 3 to
6 feet. waves occasionally around 10 feet. 
.wednesday night...northwest winds 15 to 20 knots. lake effect
snow showers likely. waves 3 to 6 feet building to 4 to 7 feet,
then subsiding to 3 to 6 feet. waves occasionally around 9 feet. 
.thursday...northwest winds 15 to 20 knots becoming west. a
chance of snow showers in the morning, then lake effect snow
showers in the afternoon. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.thursday night...west winds 15 to 20 knots. lake effect snow
showers. waves 5 to 8 feet. waves occasionally around 10 feet. 
.friday...west winds 15 to 25 knots becoming northwest. lake
effect snow showers. waves 5 to 9 feet subsiding to 4 to 7 feet.
waves occasionally around 11 feet. 
.saturday...northwest winds 10 to 15 knots becoming north. a
chance of snow showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.sunday...north winds 10 to 15 knots becoming southwest. a chance
of snow showers. waves 1 to 3 feet. 

$$
© Copyright 2025 WeatherFlow, Inc · Contact Us ·