Wildfires across the West have worsened conditions for residents in the region.
August was the hottest ever recorded at Portland International Airport, where the National Weather Service recorded an average monthly temperature of 73.6 degrees.
On Tuesday, Ramona hit 108 degrees, setting a new August 29 heat record that was previously 105. The range for Napa will be between 98 and 102 degrees, he said.
Forecasters said more heat could be expected when remnants of Tropical Storm Lidia move north from Mexico's Baja California during the weekend.
The Weather Service has posted an Excessive Heat Watch for Josephine, Jackson, Douglas and eastern Curry counties as well as the Southern Oregon Cascades and Siskiyou mountains. The last time temperatures were that high in San Francisco was on June 14, 2000 at 103 degrees.
In addition, the Oregon Department of Environmental Quality has extended the current Air Quality Alert until further notice, meaning wildfire smoke will continue to pour into the southwest part of the state.
With the weather for Labor Day expected to be mostly sunny and warm, the National Weather Service is predicting cooler temperatures as the week progresses. The high is expected to be 72 degrees.
The upper-level ridge is expected to shift slightly eastward early next week, bringing cooler temperatures to coastal locations of northern California.
Keep in mind to take extra precautions if you will be spending time outdoors during this extreme heat.
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