As I mentioned it is going to be a dry season so a humidifier will be very useful to keep your skin dehydrated from dry air.
Seasonal changes can be harsh on the skin so it is important to switch your cleanser to something more gentle for the fall.
You don't need to exfoliate too much in the fall, but you still do need to with a gentle exfoliator once a week.
Sadly, a humidifier alone isn't enough, you need an overnight mask and lip balms to give your skin the ultimate hydration.