When will the heat end?

It seems at this time of the year I start wishing for the heat to end. This year has been tough. In addition to my exercise routine, I have a pet sitting business that keeps me out during the high heat of the day. Combine that with a couple of broken ribs and I have really taxed myself this year. All it takes is the first low humidity day and I feel like tearing it up again. I hope for that soon...