From the National Weather Service Area Forecast Discussion earlier this evening
As of 8:54 p.m. PDT Thursday ... another summer day comes to a close along the Central California coast. Keeping with the trend ... afternoon highs were slightly below normal once again. Stratus continues to be banked up along the coast and starting to push into the bays and inland valleys. Profiler network and 00z Oakland sounding from this evening indicate the marine inversion varying from north to south 1500-2000 ft. Local onshore flow (SFO-SAC) maxing out once again above +4.0 mb with strong winds blowing through San Francisco Bay and the West Delta. Tomorrow should to be very similar to today ... with widespread stratus coverage during the morning then burning back to the coast by midday. Localized areas of drizzle can be expected as well.
What's all that mean? It's gray, foggy and cool here. This week, we could sell that to folks in Portland, Seattle, and just about everywhere else north, east, and south of here. (The picture: Looking across Berkeley Marina to Mount Tamalpais from the I-80 pedestrian bridge, just after sunset tonight.)