To order copies of permissions/licensing, please go to:Average Lake Ontario water temperatures hit a record 25 C in July, right on time for joyful beachgoers freed from But enjoy a balmy beach dip sooner rather than later — because toxic algae love warm water even more than you do.July satellite data from the U.S. National Oceanic and Atmospheric Administration’s “CoastWatch” program shows surface water temperatures ranging between three and five degrees higher than normal across most Great Lakes other than large, typically colder Superior.On July 10, Lake Ontario’s average surface temperature reached around 25 C — a record this early in summer and on par with the highest such measurements in any month since satellite data collection began. US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service Burlington, VT 1200 Airport Drive South Burlington, VT The current water temperature record on Lake Huron is 73 degrees on July 16, 2013.Lake St. Clair has been as warm as 79.3 degrees this year, with the record being 81.1 degrees on July 30, 1999.The odd lake out on vying for new water temperature records is Lake Superior. It was off-limits to swimming June 23 and July 13. We may have seen that surge in water temperatures last week be the warmest water of the summer.Note to readers: if you purchase something through one of our affiliate links we may earn a commission.Registration on or use of this site constitutes acceptance of our © 2020 Advance Local Media LLC. rights reserved. Burlington is fortunate to have the Niagara Escarpment, a UNESCO world biosphere reserve, in our backyard and Lake Ontario in our front yard.With that great fortune comes great responsibility. (The lakewide average also flirted with 25 C in 2012 and 1995, but not until August. Republication or distribution of this content is The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users. But I’ve also found calm winds are needed for days so the colder bottom water is not churned upwards and mixed with the warm surface water. The heat is otherwise hard on a lot of lake wildlife, Krantzberg said. The previous warmest water was 77.0 degrees on August 15, 1995.Lake Ontario average surface water temperature this year (red line) versus the long-term average (blue line)Lake Erie technically came within just two-hundredths of a new record also. More records could yet be broken, since Lake Ontario tends to see temperatures peak in August.That’s not a good thing, said McMaster University environmental engineering professor Gail Krantzberg — certainly not for the environment, or even for swimmers in the long run.“Algal blooms just love the heat,” said Krantzberg, a Great Lakes science expert. Information on Great Lakes water levels is available from several agencies in the United States and Canada. Similar systems are operational in the other 4 Great Lakes as well. While data of this caliber only goes back to 1995, the July 10 reading was the warmest surface water ever recorded on Lake Ontario. Hamilton in Lake Ontario is an exposed beach/Jetty break that has fairly consistent surf Works best in offshore winds from the southwest. Average Lake Ontario water temperatures hit a record 25 C in July, right on time for joyful beachgoers freed from pandemic lockdown.. However, right now with what I’m seeing for the next two weeks, no long lasting extreme heat is coming. The warmest sea in lake Ontario in November is 12.6°C/54.7°F, and the coldest sea temperature in November is 5.9°C/42.6°F. expressly prohibited without the prior written consent of Toronto She said storms can push fertilizer and overflow sewage into the harbour, providing a “feast” for algae already enjoying the hot summer.