Northern California residents can expect a cool morning on Wednesday, with a mix of sun and clouds and mild temperatures. However, the Delta breeze will be less noticeable compared to Tuesday. High temperatures will reach the upper 60s to low 70s. The Sierra region may experience isolated afternoon showers or thunderstorms over the next few afternoons, particularly south of Highway 50. Temperatures will cool down on Thursday, with showers expected in the Foothills and Sierra later in the day. The rest of the week will bring near to below-average temperatures. Friday will be the coolest day, with a slight chance of showers in the Valley. The weekend will be dry and gradually warmer, with Sunday seeing a return to warmer temperatures.