A multi-day heat event that kicked off July is expected to ease up after Tuesday.
Environment Canada has issued a heat warning for a large portion of the region, with daytime high temperatures expected to approach or exceed 30 C on Tuesday.
The overnight low temperatures are expected to remain in the mid to high teens.
Environment Canada cautioned that extreme heat affects everyone, and that hot and humid air can cause deteriorated air quality.
Cooler temperatures are expected beginning Tuesday night.