11pm update from meteorologist Dave Hovde: I think shower chances are looking less likely for most outside of the far northern SLO coast. The low looks like it is tracking too far north. Recent model updates show a better chance of a miss than a hit in terms of rain for most of the area.
(from prior story)
We were already feeling the weather start to change yesterday when interior winds came up and today they are at advisory levels into this evening. This has dramatically cooled inland temps which broke one record this week and threatened a few more times.
Coastal areas already got a little drizzle with a deep marine layer this morning but an upper low off the coast will quickly movie over and thru the area on Saturday.
It already produced some virga today (rain falling from clouds that evaporate on the way to the ground). It seems reasonable that the system should be able to produce some scattered showers as it moves through.
The best chance for decent measurable rain looks like the SLO north coast and especially the coastal hills where up to .25" could fall, elsewhere I think we see some scattered light showers on and off as the low moves through with most totals under .15", in fact I think many places end up with hundredths and some with no rain at all (especially locations south and east).
That all happens Saturday, Sunday looks like a spray of high clouds thru the area filtering the sun.
Everything associated with the passage of the upper low will keep temps on the mild side to below average.
The mild streak continues into the middle of next week with another deep trough moving through Central and Southern California. I think this second wave will likely not produce rain, but it will keep the marine depth deep enough to keep inland temps near average. At the coast we could see another return of very sluggish marine cloud cover, the "June Gloom".