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Also: Lake St. Clair
Also: St. Lawrence River
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Also: Lake St. Clair

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  Current Lake Ontario Conditions
What's New | Great Lakes Observing System Data Portal | Weather | Water Levels | Water Temperatures
Beaches | Boating Safety/Security Advisories | Fishing Conditions
Lock & Port Updates | Ice Conditions

What's New
2 Asian carp found in ponds near Toronto waterfront
Toronto Star (7/29)
Asian carp, reviled as the vanquishers of native aquatic species and seen posing a huge ecological threat, have somehow found their way into Lake Ontario.

New website posts water sample results of local Lake Ontario beaches
Oswego County Today (7/27)
The public can check the status of Lake Ontario swimming beaches before they head off to the water this summer through a new website developed by the state Department of Health.

Cayuga county homes just feet away from falling into Lake Ontario
CNYCentral.com (7/7)
The eroding Lake Ontario shoreline foreshadows many problems for coastal residents within the area.

Shoreline property owners concerned with plan to raise level of Lake Ontario
The Valley News (7/23)
A number of residents living along the shore of Lake Ontario are concerned with the International Joint Commissionís proposed plan to tinker with the levels of Lake Ontario.

Border patrol boat on Lake Ontario
WROC-TV (3/24)
This week, a patrol boat was put into Lake Ontario as part of a beefed up effort to make our border entries more secure by patrol agents.

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Great Lakes Observing System Data Portal

Great Lakes Observing System Data Portal

Click to view real-time and historic lake conditions; water levels, wave heights, air and water temperatures and more from the station or buoy of your choice.

Developed by the Great Lakes Observing System (GLOS), a regional node of the U.S. Integrated Ocean Observing System (IOOS) initiative.


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Recent Marine Data
National Data Buoy Center, National Weather Service (NOAA)
Real-time data from all US Moored Buoy Stations, Canadian Moored Buoy Stations and C-MAN Stations in Eastern / Western Great Lakes. Dial-a-Buoy phone service is also available.

Lake Ontario Marine Weather Forecasts
National Weather Service

Lake Ontario Open Water Text Forecast
National Weather Service

Surface Weather Forecast
The Weather Underground
Enter a city, state, zip code or station code for the current National Weather Service forecast
Examples: "Albany", "NY", "Albany, NY", "12233", or "ALB"

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Real-Time Water Levels

These maps were prepared in partnership with the National Oceanic & Atmospheric Administration (NOAA) and its Center for Operational Oceanographic Products and Services (CO-OPS).

NOAA Logo - Link to NOAA Website
Coordinating Committee Logo - Link to CC Website

Lake Superior | St. Marys River | Lake Michigan | Lake Huron | St. Clair River
Lake St. Clair | Detroit River | Lake Erie | Niagara River | Lake Ontario | St. Lawrence

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Water Temperatures
Lake Ontario Surface Water Temperatures
Michigan Sea Grant
Contour maps of surface water temps. This site uses satellite imagery from the Great Lakes CoastWatch Node to "build" a composite map of surface temps.

Lake Ontario Temperature Profiles
NOAA Great Lakes Environmental Research Laboratory (GLERL)

Lake Ontario Temperature Transects
NOAA Great Lakes Environmental Research Laboratory (GLERL)

Lake Ontario Water Temperatures
NOAA Great Lakes Environmental Research Laboratory (GLERL)

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Great Lakes BeachCast
Great Lakes Information Network
An Internet gateway to information on Great Lakes beach conditions, including health advisories, weather, monitoring data and more.

Toronto Beach Monitoring
Environmental Defence Canada
Information about the Blue Flag beach health initiative and the pilot program in the City of Toronto.

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Boating Safety/Security Advisories
Information for U.S. and Canadian Cross-Border Boaters
U.S. Coast Guard Ninth District
Information and requirements for U.S. and Canadian recreational boaters planning cross-border travel on the Great Lakes.

Ninth Coast Guard District Public Information Site
U.S. Coast Guard Ninth District
News on active Coast Guard searches and rescues.

Requirements for Foreign Recreational Boaters In Canadian Waters
Canadian Coast Guard, Office of Boating Safety
Information on boating safety and environmental protection regulations in Canadian Waters.

What American Boaters Need to Know When Entering Canada
U.S. Coast Guard, Office of Boating Safety
Important contact information and guidelines for boaters entering Canadian Waters.

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Fishing Conditions
Lake Ontario and Salmon River Fishing Report

Let's Fish Ontario!
Ontario Ministry of Natural Resources
Ontario fishing information and resources.

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Lock & Port Updates
Great Lakes St. Lawrence Seaway System : Customer Advisories
Great Lakes St. Lawrence Seaway System
Updates and advisories for Great Lakes locks and canals.

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Ice Conditions
Eastern Great Lakes Ice Analysis
NOAA National Ice Center

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Related Resources
GLIN: Agencies and Organizations, Weather
GLIN: Climate Change in the Great Lakes Region
GLIN: Great Lakes-St. Lawrence Hydrology
GLIN: Great Lakes-St. Lawrence Water Flows
GLIN: Great Lakes-St. Lawrence Water Levels

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Great Lakes Information Network
Updated: December 15, 2017
Selected Photos: Copyright ©John and Ann Mahan
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