As Jen mentioned in Morning News, Saturday was Seattle's wettest September day on record. Sea-Tac Airport measured 1.71 inches of precipitation on Saturday, surpassing the 1.65 inch record that was set on September 22, 1978. To put our recent string of downpours in perspective, Seattle only averages 1.52 inches for the entire month, September typically being our third driest month of year. So far, Seattle has recorded 4.80 inches this month, making it our third wettest September on record.
Of course, one can't say if this unusual pattern is due to climate change or natural variation. But the climate change models do predict warmer, wetter weather for the Pacific Northwest. So get used to it.