The autumnal equinox has passed, and so fall officially has begun.
We can at last expect the oppressive heat of summer to taper off. Sometimes, though, summer returns after a week or two, when the Santa Ana winds start. These dry winds originate in the high desert, and as they blow downhill, atmospheric pressure heats the winds further. And the result is something that dessicates vegetation, fans wildfires, and charges doorknobs of all kinds with static eletricity.
Fortunately, that usually ends around November.