I've never seen the hummingbirds being bothered by the scrub jays in my area. Mine also get along well with the similarly sized hooded orioles, even though those make frequent visits to the sugar water feeders. They ignore the mockingbirds (I would not mind if the hummers formed a gang and chased that annoying species away!).

Our hummingbird activity has even picked up lately. I'm in south OC, and although it has been hot lately, there is more of an ocean influence than a few more miles inland. If you are in a dryer, hotter area of Los Angeles, they could be moving closer to the beach. Or, as you said, they have moved on to something else that is in heavy bloom now. When it is really hot, I have seen hummingbirds drink from our garden fountains. If you don't have moving water available nearby, they might also be shifting closer to a source for water.

I have a scrub jay hanging around, and leave peanuts for him at all times. I also have 7 hummingbirds hanging out at my feeders (well, when the rufous isn't chasing them off). There are no issues between the jay and the hummingbirds here.

Excellent to hear that you two haven’t experienced problems with scrub-jays chasing off hummingbirds. Thanks!

Somewhere else, I was told that California Scrub-jays are related to Crows (corvidae family) and their diet can include the eggs of other birds’ nests. Hopefully my local hummingbird and wrens are good at hiding their nests from these sharp-eyed jays.

Update: Hummingbirds are back as the bottlebrush “tree” is starting to bloom again, and they’re finding my feeder too.

The hummers and jays are coexisting quite well. Thanks.