September 2025 kicked off with a stretch of unseasonably high temperatures across much of western North America.
September 2025 kicked off with a stretch of unseasonably high temperatures across much of western North America. New heat records were set in British Columbia, Canada, and the U.S. Pacific Northwest as a zone of high pressure known as an omega block settled over the region for several days.
This map shows air temperatures in North America on September 3, 2025, at 2 p.m. Pacific Time, modeled at 2 meters (6.5 feet) above the ground. It was produced by a version of the GEOS (Goddard Earth Observing System) model, which uses mathematical equations to represent physical processes in the atmosphere. The darkest reds indicate areas where temperatures approached 40 degrees Celsius (104 degrees Fahrenheit).
On September 3, a new high temperature record for September in Canada—40.8°C (105.4°F)—was set in Ashcroft, British Columbia, about 200 kilometers (120 miles) northeast of Vancouver. That sort of heat is more common this time of year in parts of the U.S. Southwest, in places like Phoenix, Arizona.
Read More: NASA Earth Observatory
Image: NASA Earth Observatory image by Michala Garrison, using GEOS-5 data from the Global Modeling and Assimilation Office at NASA GSFC.
