National Weather Service warns of heat and wildfire smoke in Oregon; Heat Advisory in place for Portland metro with unhealthy air and temperatures near 100
Bob FergusonNational Weather ServiceKOIN 6

National Weather Service warns of heat and wildfire smoke in Oregon; Heat Advisory in place for Portland metro with unhealthy air and temperatures near 100

The National Weather Service has issued a heat advisory for the Portland metro area, with temperatures nearing 100°F and unhealthy air quality due to wildfire smoke. Over 30 wildfires are burning across Oregon, prompting warnings of hazardous conditions and air quality index readings expected to reach 167 by Monday evening.

OregonLive.com OregonLive.com+2 sources3 August 2026 · 19:44 UTC
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The National Weather Service has issued a heat advisory for the Portland metro area, with temperatures expected to reach 100°F and air quality deteriorating due to wildfire smoke from over 30 wildfires across Oregon.123

Winds from the east are predicted to bring smoke and haze into the upper Willamette Valley, with air quality index readings forecast to reach 167 by Monday evening, categorized as unhealthy for sensitive groups.4

The advisory will be in effect from Tuesday afternoon through Wednesday night, with high temperatures expected to remain in the 150 range for air quality, becoming especially hazardous late Wednesday into Thursday.7

Officials warn that smoky air can cause burning eyes and worsen preexisting heart and lung conditions, advising residents to limit outdoor activities and ensure their homes are sealed against smoke.8

As of now, Multnomah County has not announced plans to open cooling shelters, despite the forecast indicating a significant heat wave.9

The weather service has issued several alerts, including a fire weather warning for the southern part of the Willamette Valley, where gusty winds and low humidity could exacerbate fire conditions.

With high pressure dominating the region, the heat is expected to build significantly, with temperatures rising into the mid-90s on Tuesday and potentially reaching the low 100s on Wednesday.

The combination of heat and smoke is expected to persist through the week, raising concerns for public health and safety.

Key Insight
“Air Quality Index readings are forecast to hit 167 Monday evening and climb into the 180s by late Wednesday as 2 million acres burn in 30-plus Oregon wildfires. Officials advise people to avoid prolonged time outdoors and check door and window seals, while Multnomah County has not announced plans to open cooling shelters.”
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CuriousCats studied:
1
OregonLive.comOregonLive.com
“As some 2 million acres continue to burn in more than 30 wildfires across Oregon, forecasters predict a shift in winds will bring potentially dangerous air quality to the Portland metro area, which is already expected to see near-triple-digit temperatures throughout the week.”
OregonLive.com →
2
KOIN.comKOIN.com
“With this immediate forecast, the National Weather Service has issued several weather alerts.”
KOIN.com →
3
KATUKATU
“High pressure is in control of the region weather wise. Offshore flow will bring in wildfire smoke from east of the Cascades on Monday. Heat starts tomorrow with three days nearing 100 degrees”
KATU →
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