Heat advisory issued for Snohomish County as temps expected to rise

Published 12:30 pm Monday, July 20, 2026

EVERETT — The National Weather Service issued a heat advisory on Monday as temperatures across Snohomish County are expected to climb into the upper 80s and mid 90s throughout the middle of this week.

The advisory, which goes into effect Tuesday morning and ends Wednesday night, warns those in the lowland areas of Snohomish County and other parts of the Puget Sound region about the coming high temperatures, which could reach as high as 95 degrees Fahrenheit in some parts of the county.

Johnny Burg, a meteorologist with the National Weather Service in Seattle, said that on Wednesday, temperatures in Everett could reach 87 degrees. In Arlington, 90; in Monroe, 94 and in Sultan, 95.

On top of the daytime heat, overnight temperatures are also expected to be higher than normal, according to the National Weather Service, hovering around the low to mid 60s. Health experts say that elevated overnight temperatures can be dangerous because it doesn’t allow the body to cool down and recover from daytime heat, the Associated Press reported.

Smoke from wildfires burning in British Columbia, Canada is also expected to travel south toward the Puget Sound area, the weather service predicted, though it will likely remain elevated and not affect air quality too significantly in the lowland areas.

“We’re not expecting anything to degrade too much, but I would tell people to just keep an eye on things,” Burg said.

To combat the hot weather, the National Weather Service recommends staying hydrated, getting out of the sun and using air conditioning if possible. If you spend time outside, take frequent breaks if you are working and wear lightweight or loose clothing if possible. Don’t leave pets or children in a vehicle under any circumstances, Burg added, and be on the lookout for signs of heat stroke, which can include confusion, loss of consciousness or seizures, according to the Centers for Disease Control. If someone is having a heat stroke, call 911.

Temperatures are expected to begin cooling Wednesday night as the remnants from a tropical storm traveling off the coast of California reaches the Seattle area. Thursday’s temperatures are expected to be five to 10 degrees cooler than the previous day, Burg said, with a slight chance of rain. Highs during the weekend will likely range between the mid 70s to low 80s.

Will Geschke: 425-339-3443; william.geschke@heraldnet.com; X: @willgeschke.