Ontario — Water Temperature Today and Throughout the Year
Discover water temperatures in Ontario (Canada), with real-time data and annual trends. Find all locations in the region and check the water temperature in them. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
Coastal Seas and Oceans
Water Temperature in Lakes and Rivers
Popular Lakes
Popular Rivers
Popular Places
- Toronto37°F
- Mississauga37°F
- Kingston35°F
- Ottawa34°F
- Brantford35°F
- St. Catharines38°F
- Barrie34°F
- Niagara Falls36°F
- Sarnia39°F
- Pickering36°F
- Oshawa37°F
- Peterborough36°F
- Newmarket35°F
- Waterloo34°F
- Guelph34°F
- Ajax37°F
- Milton36°F
- Greater Sudbury32°F
- Burlington36°F
- Oakville37°F
- Cambridge34°F
- Kitchener34°F
- Tecumseh39°F
- Thunder Bay37°F
- Windsor42°F
- Hamilton37°F
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Ontario, located in central Canada, is home to a variety of freshwater bodies, including the Great Lakes and numerous rivers. While Ontario does not have a coastline along the ocean, it boasts the shores of Lake Ontario, Lake Erie, Lake Huron, and Lake Superior, as well as many inland lakes and rivers. The temperature of these bodies of water varies widely depending on the time of year and the specific location.
During the summer months, water temperatures in the Great Lakes around Ontario can range from 60°F to 75°F (15°C to 24°C), offering a refreshing environment for swimming and other water activities. The northern parts of the Great Lakes, such as Lake Superior, tend to stay cooler, with temperatures hovering closer to 50°F to 60°F (10°C to 15°C) during the summer. Inland lakes and rivers throughout Ontario, especially those located in the southern part of the province, can warm up slightly more, providing more comfortable swimming opportunities, often reaching temperatures between 70°F to 80°F (21°C to 27°C).
In the winter, the temperatures of Ontario's lakes and rivers drop significantly. The Great Lakes can experience temperatures near freezing, around 32°F (0°C), and often have icy conditions along the shorelines. Inland rivers and lakes may freeze over, especially in more northern or higher elevation areas. Despite the cold winter months, ice fishing and other winter activities are popular, with many locals taking advantage of the frozen waters for recreation. Overall, Ontario's water bodies offer diverse temperature conditions, from cool and refreshing in the summer to frozen and harsh in the winter.