Environment Canada is expected to issue a heat warning for southern Ontario, with hot conditions potentially lasting until Tuesday, a meteorologist with Environment Canada told CBC Toronto.

Daytime temperatures of over 30 C are expected throughout southern Ontario, particularly along the Highway 401 corridor between Windsor and Ottawa, Crawford Luke said.

The hottest days are expected to be Sunday and Monday, reaching about 33 C. Humidity levels are expected to be slightly less severe this weekend compared with previous heat waves this summer, making it feel like high 30s, potentially low 40s, he said.

Nighttime lows of around 20 C will provide little relief, particularly in big cities like Toronto due to the "urban heat island effect," Luke said.

Hot temperatures are expected to conti

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