Environment Canada warns “significant heat and humidity” will blanket the National Capital Region this weekend.

A Heat Warning is in effect for Ottawa-Gatineau and all of eastern Ontario.

Daytime temperatures in the low to mid 30s with afternoon humidex values of 40 or higher are expected today and Saturday.

Environment Canada’s David Phillips tells CTV News Channel that this will be the “warmest moment” of the summer for most of Ontario and eastern Canada.

Phillips says while we can deal with the warm temperatures during the day, “but at night, those temperatures are very elevated and it’s often that’s where it creates most of the health issues.  

Ottawa Public Health is reminding people to drink plenty of water, avoid strenuous outdoor physical activity and limit direct exposure to the sun.

Medical Officer of Health Dr. Vera Etches tells CTV News Channel if people aren’t drinking plenty of water and don’t have access to a cooler environment, “their body could exhaust their ability to cool down.”

Environment Canada says cooler and less humid air is expected to arrive in the wake of a weak cold front on Sunday.