BC Wildfires

Wade Harris / Courtesy of Wade Harris

Seattle's weather is about to revert to its more normal, pleasantly mild and occasionally moist summer pattern.

Rain in the weekend forecast should wash out the gritty smoke from British Columbia's wildfires that has plagued the region for more than a week now. The precipitation will also put an end to the long dry spell the city has experienced.

The National Weather Service issued an excessive heat warning for western Washington and Oregon Wednesday and said the highs in Seattle on Thursday could hit 95 (35 Celsius) while Portland could reach 105 (40.5 Celsius).
Ted S. Warren / AP Photo

Seattle’s above-normal temperatures have been tempered somewhat by a grimy layer of smoke from British Columbia’s wildfires that moved in Tuesday. The influx has made air quality in and around the Emerald City worse than Beijing’s.

Even as the air cools a bit over the weekend, the temperatures will stay far above normal, with the haze dissipating only somewhat and quite slowly, says KNKX weather expert Cliff Mass, a professor of Atmospheric Sciences at the University of Washington.