It was a warm spring day topping out at 69 °F (21°C), but high temperatures will drop down to a more seasonal 58°F (14°C) tomorrow.
The National Weather Service is predicting a toasty last half of summer, due to an expected La Niña climate pattern.
We will get more upper-level ridges of high pressure (heat domes) than usual. These are common in summer but tend to be most persistent during La Niña.

The Pacific rhododendron (Rhododendron macrophyllum) is is a large-leaved species of Rhododendron native to the Pacific Coast of North America. It is the state flower of Washington State.