Canada — Water Temperature in Seas, Lakes and Rivers
Check today’s water temperatures across Canada, including seas, lakes, and rivers. View real-time updates and seasonal ranges for both coastal and inland waters. 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
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Canada’s coastlines and inland waters display a wide range of temperatures depending on region and season. Along the Pacific coast of British Columbia, sea surface temperatures typically run from about 6–12 °C (43–54 °F) in spring and fall to 10–15 °C (50–59 °F) in the warmest summer months. The Atlantic coast is somewhat warmer in summer in southern areas, often 12–18 °C (54–64 °F), but drops much lower in spring and autumn. The Arctic Ocean and far-northern waters remain near freezing for much of the year, commonly close to 0–2 °C (32–36 °F) and covered by sea ice in winter. The Great Lakes and southern inland lakes often warm to comfortable swimming conditions in summer, frequently 18–24 °C (64–75 °F), while northern lakes and many rivers may only reach 10–15 °C (50–59 °F). Rivers can vary rapidly with snowmelt and rain; spring runoff produces very cold, fast-flowing conditions, whereas shallow, protected stretches can be warmer in late summer.
Swimming Conditions
Swimming is widely practiced in Canada where conditions and public policies permit; designated beaches on lakes, rivers and coasts are open in summer months when temperatures and safety conditions allow. Many municipal beaches are staffed by lifeguards and monitored for water quality, and advisories or closures occur when bacterial counts are high, dangerous currents or tides are present, or ice persists. Winter swimming is limited to supervised polar dips and organized ice-swimming events, but routine swimming is not possible where surfaces are frozen and hypothermia risk is high. Even in summer, cold water, sudden depth changes, rip currents and weather shifts make caution, flotation aids and local guidance advisable.