WEST CARLETON – Environment Canada has issued a heat warning for the rest of the week.

“A hot and increasingly humid air mass will begin to affect eastern Ontario on Saturday and last through at least Sunday,” Environment Canada released in a statement this afternoon (July 17). “Cooler and less humid conditions may arrive on Monday.”

Daytime high temperatures: 31 to 34 degrees Celsius

Overnight low temperatures: 20 to 23 degrees Celsius

Humidex values: high 30s Saturday increasing to near 40 Sunday

“Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category,” Environment Canada said. “Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.”

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.