I carry too much stuff and just chalk it up to raising the exertion level in my exercise for the day.

Since I'm not hiking in SoCal I carry several options in warmer clothes. Have needed some of them when a pleasant weather forecast turned into 4" of wet snow before I could get back to the car.

In theory I could spend the night out if I had to. In practice, I haven't practiced that so it would be a difficult night.