In OR and then east of the Cascades, June is easily wetter than September.
The SW quadrant of WA kind of trades off in that battle, and then in NW WA it's reversed as the early fall jet stream obviously gets going in a very meridional fashion and strikes harder up there.
Jared of course religiously maintains a very OLM-PAE centric view of the regional climo.....
Currently standing at 0.53" on the day and 3.75" on the month. Almost as "dry" as what @snow_wizard is “suffering” through right now. And I average about 55"/year of precip total, which I believe is significantly more than his area does. So even more “anomalous” here.
What I think is happening, though, is that @MossMan is just scoring well this month. Compare your backyard’s totals to those of the big winner, and of course you will come out on the short end.