And/or the people already in them are trying to keep them secret lest they gain all the problems people are fleeing from in the first place.

If those places can suddenly hit 115F then so can the Bay Area. I am not saying it is likely but who would have said it is likely that Portland would hit 115.

It’s true in general. What really surprised me though was the recent/current heat wave across all of the west coast - it has been foggy and cool the entire time in the Bay Area. I hope that holds even as the climate changes, though I don’t know if it will.