British Columbia set a new national September heat record with 40.8 C in Cache Creek, as wildfire smoke triggers widespread air-quality alerts. Multiple heat warnings remain in effect across the province.

Ashcroft, British Columbia hit 40.8 C (105 F) on Sept. 3, setting the hottest September temperature ever recorded in Canada. A regional weather observer called the late-season heat highly unusual and linked it to a blocking high-pressure system.

Federal fisheries experts paint devastating picture of the challenges facing Pacific salmon and point to climate change as the main culprit.

Warm temperatures prompting spring run-off combined with heavy rainfall in some areas caused devastating floods and mudslides in several parts of B.C.