The recent warmth has been associated with a broad upper level ridge of high pressure over the West Coast and eastern Pacific, as illustrated by the upper level map at 5 PM Thursday below.
However, the hallmark of this summer has been the transient nature of West Coast high pressure, with the tendency to have periods in which troughing (low pressure) has developed over the region. Such troughing will be happening in spades during the next week, as illustrated by the upper level map for Saturday at 5 PM: a low is centered over British Columbia, with a trough over the Northwest.
This time of the year it is hard to get heavy rain even with weak troughing. Thus, the 24-h precipitation forecast ending 4 PM on Tuesday shows some light rain over western WA, but modest wetting over British Columbia.
Turning the National Weather Service GFS model, here is the accumulated forecast precipitation over the next 10 days. The West Coast is starkly drier than the rest of the continent, with Oregon and coastal CA being dry. In contrast, the East Coast is soaked.
With much cooler and wetter conditions over the Northwest, the number of wildfires has been minimal. With the upcoming cooling, one should expect the continuation of the benign fire season.