In the shorter term... the ECMWF has been trending a bit warmer and drier for this coming weekend. The 12Z run shows less low clouds and highs in the mid 70s both days in Seattle.
Oceans drive our climate. Oceans are warmer. Every degree releases exponential more moisture in the air. Every degree changes the air pattern around the world. Every degree takes longer to cool down in the winter. It's the oceans.