A more extensive marine layer will prompt night to morning cloud cover for coasts and valleys through the weekend. Interior valleys can expect a major cool down, with temperatures dropping near or below average through the weekend. This is due to an area of low pressure expected to deepen the marine layer. This will also bring a chance of drizzle or light rain through the weekend, especially along foothills.
Onshore flow will continue to strengthen ahead of a few systems expected to sweep across our state. This will prompt an overcast start to Friday, with slower clearing and little to no clearing along beaches. Temperatures will cool along the coast slightly, with highs in the upper 50s to 60s. While interior valleys and mountains warm in the upper mid to upper 70s.
The system will park over the weekend allowing Saturday to remain cloudy and temperatures to fall below average. Saturday likely be the coolest day out of the week, with most areas in the 50s to 60s including valleys.
A better chance of drizzle is expected late Saturday and into Sunday, this will bring a chance of some accumulation. Amounts falling well below one tenth of an inch but enough to get use from windshield wipers. Temperatures will warm gradually early next week.