Summertime rain in most of California is VERY rare. Especially so in coastal southern California.
We had a nice one far enough away a few weeks ago. About 20 miles. The wind blew the other way, so if the fire stations weren't empty, you wouldn't have a clue anything was going on. However, air quality SUCKED in the Bay Area.
There was also a pretty good plume somewhere near Cambria or Morro Bay when I was driving up from Palmdale a bit over a week ago (visible far in south from Camp Roberts).
It's been a moderately dry year and there have been heat waves. It's also been VERY dry. So yes, it's going to be a relatively nasty fire season.