People have also been asked to move to cooling centers if possible.
Much of British Columbia is expected to experience extreme heat throughout the week.
Environment Canada predicted that Kamloops will reach a high of 38 degrees by Wednesday and Port Alberni is expected to hover around 30 degrees this week.
Emergency Management Minister, Bowinn Ma has urged BC residents to take precautions to avoid the heat, drink more water and fluids and limit outdoor activities.
People have also been asked to move to cooling centers if possible.
In the heat warning issued on Saturday, the Department of Meteorology predicted that the temperature would reach 33 degrees in Vancouver, Fraser Valley and 29 to 32 degrees in East Vancouver Island and the Sunshine Coast.
There may be some relief from the heat from Thursday.
More than 80 per cent of BC has reached category four or five drought conditions.