TORONTO - Toronto's sixth heat alert of the season was cancelled late this morning.

Toronto's medical officer of health, David McKeown, initially issued the alert yesterday after humidex values hovered around 40C.

He says during heat alerts people should check on family, friends and neighbours, especially those at risk of suffering from heat-related illness.

Humidex advisories were in place over the weekend across much of southwestern Ontario.

Everyone is advised drink lots of fluids and not wait to feel thirsty and those feeling overheated should seek out an air-conditioned place such as a shopping mall.

Landlords of buildings without air conditioning are being encouraged to provide a dedicated cooling room for residents to escape the heat.