I'm pretty sure I just read recently that the temp. hit 44C here in Lillooet in July of 1941.
I thought you might be right JLM but - from what I read here, Sask. wins this one.
The highest temperature officially recorded in Canada is 45 °C (113 °F) on July 5, 1937 at Midale and at Yellow Grass, two small towns in southeastern Saskatchewan. The Canadian high sits far below North America's all-time maximum temperature of 56.7 °C (134 °F) in Death Valley, California on July 10, 1913.
Western Canada
Heat waves of over 40 °C (104 °F) have repeatedly swept through towns and cities in southern Manitoba, Saskatchewan, Alberta and the southern interior of British Columbia.
Here are the highest temperatures recorded for some of the hottest spots in western Canada. Many of these places have topped 40 degrees Celsius more than once.Location°CDateLillooet and Lytton, BC44.4July 16 & 17, 1941St Albans, Manitoba44.4July 11, 1936Emerson, Manitoba44.4July 12, 1936Brandon and Morden, Manitoba43.3July 11, 1936Regina, Saskatchewan43.3July 5, 1937Fort Macleod, Alberta43.3July 18, 1941Oliver, BC42.8July 27, 1939Osoyoos, BC42.8July 27, 1998Spences Bridge, BC42.5July 23, 1994Medicine Hat, Alberta42.2July 12, 1886Moose Jaw, Saskatchewan41.7Aug 6, 1949Winnipeg, Manitoba40.6Aug 7, 1949Saskatoon, Saskatchewan40.6June 5, 1988Kamloops, BC40.6July 31, 1971
Eastern Canada
A few spots in Ontario, Quebec, and Newfoundland and Labrador have also recorded temperatures over 40 °C:Location°CDateAtikokan, Ontario42.2July 11 & 12, 1936Northwest River, Labrador41.7Aug 11, 1914Windsor, Ontario40.2June 25, 1988Temiscamingue, Quebec40.0July 6, 1921A heat wave hit Canada's maritime provinces in mid-August of 1935, setting many record highs that have remained unbeaten for over 70 years:Location°CDateWoodstock, New Brunswick39.4Aug 18, 1935Rexton, New Brunswick 39.4Aug 19, 1935Collegeville, Nova Scotia38.3Aug 19, 1935Charlottetown, PEI36.7Aug 19, 1935