Cooler weather and spotty showers will move into California while the Pacific Northwest has sunny, warm days ahead. An upper-level low moving into California this weekend will not bring much rain, but it will cool things off a little bit, especially heading into Sunday and Monday. The marine layer this morning does not appear to be as solid as some recent days. As this upper-level low approaches, it will likely beef up the marine layer some across Southern California Thursday and Friday nights.