Seattle weather: Heat and smoke increase Monday and Tuesday

Published August 23, 2026 11:24 AM PDT
Seattle weather will heat up Monday and Tuesday before cooler temperatures return Wednesday.

Morning clouds and afternoon sunshine will dominate the Seattle weather pattern through the weekend. (FOX 13 Seattle)

Sunday featured a mix of morning clouds and some late-afternoon sun breaks. We watched for a few showers, mainly near the Canadian border and across the North Cascades, where an isolated thunderstorm couldn't be ruled out. 

Otherwise, the region was forecast to stay mostly dry aside from a few sprinkles this morning, with highs reaching the mid 70s.

The heat will begin to crank up Monday and Tuesday. Monday will bring highs in the upper 70s, followed by a much warmer Tuesday with temperatures climbing into the mid to upper 80s.

Seattle weather will warm from the 70s Sunday into the 80s Tuesday.

Smoke could affect the Seattle weather picture Monday and Tuesday before cooler conditions arrive Wednesday. (FOX 13 Seattle)

As temperatures rise, smoke could become a bigger concern. Air quality will stay generally good to moderate Sunday, but more widespread moderate readings will be possible Monday and Tuesday, with some locations potentially reaching unhealthy-for-sensitive-groups levels or worse (especially near the fires over the Cascades). 

The smoke is not expected to be terrible everywhere, but some areas could see noticeable impacts. Smoke forecasts can change, so stay tuned for updates.

Smoke could become more widespread around Seattle Monday and Tuesday as warmer weather settles in.

Some areas could see impacts from smoke, so monitor the Seattle weather forecast for updates. (FOX 13 Seattle)

By Wednesday, a return to more westerly winds and an onshore flow will help push some of the smoke out of our region. Wednesday through Saturday will be much more comfortable, with highs in the low to mid 70s and a familiar pattern of morning clouds followed by afternoon sunshine.

Seattle weather will heat up Monday and Tuesday before cooler temperatures return Wednesday.

Morning clouds and afternoon sunshine will dominate the Seattle weather pattern through the weekend. (FOX 13 Seattle)

Meanwhile, fire danger will remain elevated across central and eastern Washington. 

High fire danger will return Monday and Tuesday, so warm, dry conditions and gusty winds will continue to be a concern for fire weather in those areas.

High fire danger will return across central and eastern Washington Monday and Tuesday as warm, dry weather continues.

Seattle weather will stay mild, but fire danger will remain elevated east of the Cascades. (FOX 13 Seattle)

Take good care, 

Meteorologist Abby Acone and the FOX 13 Weather Team

The Source: Information for this story came from the FOX 13 Weather Team.

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