It's hard to call. The grass looks like red fescue to me. Am I close? What zone are you in?
You definitely have a small amount of some disease, you can see the lesions in the close up but I would not say that is the problem.
If it is fescue, it is still beneficial to water less frequently with more quantity.
So here is another question, I see this is one a hill so I assume you set the slope correctly...have you performed a runoff test yet? How long can your run that zone in the pics before you see small amounts of water running under the tiller canopy. Make sure that is aligned with rachio smart watering intervals.
I'm beginning to wonder if your soil is somewhat hydrophobic because the rainy days seem to help, the grass was doing better when watered everyday but not so much on once a week schedules. This is why I ask about the runoff test.
You really want water less frequently to encourage the plant to grow deeper roots (biochemically).
Keep in mind, I'm out of my pay grade here, I live in ga and have Bermuda (fescue can't survive our summer very well). The only thing that I do know is that my father in law lives in San Diego and that is some shit soil.
Thanx for the pics