Toronto – Environment and Climate Change Canada (ECCC) has issued a Heat Warning for Toronto with dangerously hot and humid conditions expected through most of the week. ECCC is forecasting daytime high temperatures of 30 to 35 degrees Celsius with humidex values of 40 to 45, and nighttime temperatures of 20 to 23 degrees Celsius with humidex values of 26 to 30.  Extreme …