Monday night update:
It’s officially the hottest July 1 on record in Seattle, with the mercury peaking at 89 degrees at Sea-Tac late this afternoon. This breaks the daily record high of 87 degrees, originally set 45 years ago in 1968 and later tied in 1995. It was also a record balmy morning around the Sound, with Seattle only dropping to 67 degrees—shattering the previous mark of 60 degrees for the warmest low temperature ever observed on the first of July.
Fortunately, relief is on the way—a blast of cool wind off the ocean is expected to surge inland overnight through the Chehalis Gap, dropping temperatures in the city into the lower 60s tomorrow morning. (The marine air has already infiltrated the North Sound via the Strait, with Everett down to a cool 71 degrees while Seattle sweats at 82.)
Clouds are possible pretty much everywhere early tomorrow, but they’ll quickly burn off, leading to another sun-splashed day up and down the I-5 corridor. Importantly, though, high temperatures will only reach the low 80s thanks to the influx of marine air.
A gradual cool-down is then expected for the rest of the week, with the mercury slipping back to near average—the mid 70s—by Friday.
In other words, a good night’s sleep is just around the corner.