There is a big warm-up this week, I doubt we'll see 100 locally but parts of California will. The warmest days look to be Thursday and Friday.
The warm-up is fueled by several factors. The jet stream ridge currently is pretty subtle but it amplifies into a huge ridge covering the entire West before week's end.
This stronger ridge supports increasing high pressure with offshore winds and the crushing down of the marine layer. This means that not only will the interior valleys warm but also the coastal valleys. I think most locations other than the beaches are already in the 80s Tuesday with warming from there.
Beaches will also warm. Next couple days look to hit the upper 70s with 80s for Thursday and Friday.
I'll say this: right now the forecast is pretty conservative. I could absolutely see the temps having to be adjusted upwards.
Additionally the pace of the winds I mentioned earlier are noteworthy in Santa Barbara county, there is a wind advisory tonight for winds which could gust to 50mph and a High Wind Watch for Tuesday PM-Wednesday for gusts which could reach 60.
Looks like a cooling trend could start Friday with more onshore flow at the coast. I do think interior areas will remain rather warm since modeling shows the ridge hanging around. We will start seeing more high clouds eventually in the forecast.