Heat warning remains in effect for Hamilton, Halton, Niagara regions

Environment Canada says a heat warning remains in effect today for southern Ontario.

The warning applies to Hamilton, Niagara and Halton-Peel, as well as Toronto, London, Greater Sudbury, Kirkland Lake and North Bay in northern Ontario.

The weather agency said maximum temperatures will be near 30 C today, though it will feel higher in some regions due to the humidity.

It said the air quality will worsen with the hot and humid air.

The agency said children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors face greater risks due to the heat.

Temperatures are expected to cool tonight.