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Seattle hit 90 degrees Wednesday, marking 11th day this year and nearing new record

KOMO-TV Seattle logo KOMO-TV Seattle 8/18/2022 KOMO News Staff
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The temperature at Seattle-Tacoma International Airport rose to 90 degrees Wednesday, catapulting 2022 to No. 2 on the list of years with the most days at that reading or higher.

If the mercury rises to that point Thursday, this year will then be tied for No. 1 on that list.

KOMO News meteorologist Shannon O'Donnell said the region is now within striking distance of reaching that new record.

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"We did make it to that 90-degree mark again today in downtown Seattle," she said Wednesday. "That puts us squarely in second place for the most of all times at Sea-Tac Airport."

The heat is expected to peak Thursday when high temperatures are likely to reach 90 degrees again before much cooler marine air arrives in time Friday.

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The National Weather Service has issued a heat advisory for many parts of Washington because of very hot weather that is broiling much of the state.

The low temperature will dip only to the upper 60s Wednesday night before rebounding again to the 90s on Thursday.

The arrival of cooler air into Friday will push the high temperature only into the upper 70s with lows in the 60s. 

Caption: KOMO

The hot weather has dramatically increased the threat of wildfires in the region.

The lower levels of the atmosphere are extremely dry with erratic winds set to raise the fire danger. 

The hottest spots will be along the western slopes of the Cascade Mountains, where some of the valley towns will see temperatures well into the 90s Wednesday and Thursday. The Cascade foothill communities from Sumas south through Sultan and Morton will easily reach the low 90s. Not much relief from the heat will occur in these areas tonight as temperatures stay uncomfortably in the mid-60s creating a high risk of heat-related illnesses.

Thursday will be the hottest day across the Puget Sound lowlands. Seattle will touch upon 90 degrees for the 11th time this year, closing in on the all-time record of 12 days in 2015. 

But not everyone will experience the heat. A persistent westerly breeze will be enough to keep coastal areas north of Everett and along the Pacific relatively cooler.

Eventually, a surge of cool ocean air races far inland Thursday night to break the heat across the lowlands. We'll wake up to a cozy canopy of clouds Friday morning as temperatures slip into the 70s by afternoon. Little to no rain is forecast across the lowlands. However, an isolated thunderstorm could pop over the Cascades Thursday and Friday, only increasing the concern of more wildfires starting by lightning.

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