A heat warning has been issued for much of southern and central Saskatchewan, including Regina and Saskatoon.
Temperatures are expected into the 30s C this afternoon, but with the humidity factored in, it will feel much warmer, Environment Canada says.
In fact, the humidex values will be in the 40s.
The conditions will ease early in the evening. That means some people may be at risk of heat stroke.
The weather agency says that while extreme heat can put everyone at risk from heat illnesses,
the risks are greatest for older adults, young children, and people with chronic illnesses such as breathing difficulties,
heart conditions or psychiatric illnesses.
Also at risk are people who work or exercise in the heat, people who don't have air conditioning and homeless people.
People are being advised to drink plenty of liquids.
The heat warning applies to the following communities: