Temperatures are expected to start climbing significantly Saturday in parts of the Pacific Northwest as an early heat wave takes hold, possibly breaking records and worsening wildfires already burning in western Canada.

The historically temperate region has grappled with scorching summer temperatures and unprecedented wildfires fueled by climate change in recent years.

The National Weather Service issued a heat advisory lasting from Saturday through Monday for much of the western parts of both Oregon and Washington state. It said the temperatures could raise the risk of heat-related illness, particularly for those who are dehydrated or don’t have effective cooling.