Heat warning in effect in Hamilton, surrounding areas could feel like 39

A heat warning has been issued for Hamilton, Niagara, Burlington and surrounding areas from Sunday until Tuesday, according to Environment Canada.

Monday is set to be the hottest in Hamilton with a high of 31 C, but it may feel more like 39 with the humidity factored in.

"There is some uncertainty in the duration of the heat event for some regions ... Over some areas the heat event could persist into Wednesday," the weather agency said in its heat warning.

Tuesday is expected to see a high of 31 C and a low of 20 C.

Environment Canada recommends people check on those who are vulnerable, stay hydrated and watch out for symptoms of heat exhaustion.

"Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue," said the weather agency.

It also suggests people close their blinds and open windows if it feels cooler outside than inside.

Using a fan or air conditioner, limiting direct exposure to the sun, and wearing lightweight, light-coloured clothing also advised. 

The medical officer of health for the City of Hamilton initiated a heat warning starting Sunday.

The city and some community agencies will open cooling areas for people to go to during the heat and humidity.