What needs to be done?
Bare minimum you need a haircut. Snip off all those dead ends and get rid of that summer singe.
A deep conditioning treatment is also recommended. You can go with a professional in-salon treatment which will use products that alter the structure of the hair. An in-salon treatment will have more immediate results on the hair. If you are the type of person who will neglect extra treatment at home because you don't have the time or energy for it then this is the treatment for you.
You can also purchase a take home treatment. A take home will have more sustained effect on your strands. If you're into super soft luxurious hair and extra time spent in the shower then this is best for you.
Some people choose both of those options, because spoiling your hair feels so good.
If you are looking for a update to your blonde or a new hue to your brunette than now is the perfect time to do it. Most clients choose to go a little darker during the fall to mimic the effects of less sun in their hair.
Let your stylist direct you.
Your hair care products can also start to change. I would switch from a Damage Remedy line to the Dry Remedy line. Since you probably won't be swimming as much or styling your hair for those late summer nights you can move away from the protein enhanced shampoo's and conditioner's. Wool and fleece hats are the next concern. These can leech moisture from your hair and also leave it feeling frizzy. Try extra moisture by using the Dry Remedy oil. You will only need a few drops.