Not my experience at all. I've lived in Marin county for 30 years, and this doesn't feel like anything extreme. I can recall many, many similar heat waves in my life. My bet is that the bay area has many micro-climates, and people's experiences can differ wildly. It's hard to extrapolate a trend from this kind of anecdota.
Edit: The summer rain/thunderstorm we had yesterday, now that is rare.