It is going to be very hot in Ontario this Canada Day long weekend, and even hotter in Toronto next week. Environment Canada issued the first official Ontario heat warning of the year this Friday, in northwestern and southern parts of the province. The extreme heat will be made worse by intense humidity into the first few days of July.

According to The Weather Network, daytime highs are expected to be in the low 30’s this weekend but will feel like 40°C thanks to the humidity. It is expected to cool down a little at nighttime, but not by much, so prepare to keep that AC unit running around the clock.

According to Environment Canada, heat warnings are only issued when temperatures or humidity levels are high enough to pose an elevated risk of heat-related illness, such as heat stroke and heat exhaustion.

"Drink plenty of water even before you feel thirsty and stay in a cool place," Environment Canada cautions on their website. "Never leave people or pets inside a parked vehicle."

Thankfully, Toronto will be mostly spared from the heavy-duty humidity over the Canada Day long weekend as the city likely won’t be hit by the extreme heat until next week.

Here’s what Toronto's 7-day forecast looks like:

"This first prolonged period of heat will start on Tuesday and continue for the rest of the week and possibly into the weekend as well," explained meteorologist Doug Gillham to The Weather Network. "High temperatures will be in the upper 20s and lower 30s each day with a humidex reaching the upper 30s and possibly approaching 40."

Stay hydrated Toronto! 

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