Parts of Ontario could experience temperatures that feel as high as 45 degrees Celsius with the humidex this Canada Day weekend, while southern Quebec and the Maritimes are also bracing for high heat.

of 鈥渆xtreme heat鈥� all weekend for much of Ontario, with cities like Ottawa, Toronto and Barrie expected to reach 35 C or higher on Saturday.

on Saturday, once the humidex is factored in.

鈥淲hat we鈥檙e seeing in parts of central Ontario are probably very close to record amounts of humidex,鈥� said David Phillips, senior climatologist from Environment Canada, noting Canada Day revelers on Parliament Hill in Ottawa could witness the hottest July 1 in 55 years.

The humidex, which describes how hot and humid the weather feels for the average person, is expected to be higher in some places than it has been in years.

鈥淲e鈥檒l just clobber the humidex,鈥� Phillips said.

The temperatures will be 鈥渟ultry鈥� and 鈥渙ppressive,鈥� he told CTV Barrie on Thursday. 鈥淵ou鈥檇 have to go to the Caribbean, or India or some tropical countries to see that kind of a situation,鈥� he added.

Phillips suggests the more heat-sensitive of the population take it easy. Find a cool space, a body of water to swim in, drink lots of liquids and wear your linen, if you鈥檝e got it, he said.

Montreal humidex could hit 40 C

Parts of Quebec are also experiencing what calls 鈥渁 significant heat event.鈥�

鈥淪unday and Monday will be especially humid, with highs in the low- to mid-thirties and humidex values exceeding 40,鈥� says a special weather statement issued for Metro Montreal and Laval.

鈥淒uring this event, overnight lows will remain near 20 degrees Celsius and will give only little or no relief from the heat,鈥� the statement goes on. 鈥淭his heat wave will persist through next week.鈥�

Montreal is forecast to reach 36 C on Saturday, and it could feel more like 39 C that day. Some public pools in the Montreal area will have extended hours to help people cool off.

Maxime Roy, from the city鈥檚 public health department, recommended that people avoid physical activity outdoors and stay hydrated.

鈥淒on鈥檛 wait until you鈥檙e thirsty to drink water,鈥� Roy said.

Maritimes bracing for warm, humid airmass

Meanwhile, for much of the Maritimes, including Halifax, Saint John and Moncton.

鈥淎 warm and humid airmass will gradually settle over the Maritimes this weekend and persist into early next week,鈥� the statement reads.

鈥淭he hottest temperatures and highest humidex values will likely be on Monday and Tuesday,鈥� the statement goes on.

Humidex values are expected to reach the mid-to-high 30s, according to CTV Atlantic Chief Meteorologist Kalin Mitchell.

With reports from CTV Barrie, CTV Ottawa, CTV Atlantic and CTV Montreal