Just because summer is coming to a close, doesn't mean hot day dangers are in the clear. When the outside temperature is 70 degrees or above, it is already too hot to leave your dog in the car even if the windows are down. Despite the publicity of hot car awareness an untold number of dogs, pets, and children die every year in parked cars due to suffocation and overheating.
As the temperature rises the car becomes like an oven. No one would ever put a dog in an oven; likewise a dog should never be left in a parked car. Even "just a minute" is too long and can result in death. Do your doggies a favor, if you can't take them in with you let them stay at home. Love your pets; don't leave them in the car!
If you see a dog trapped inside a car you can call 911, your local police department, or animal control. 14 states currently have laws that specifically address the problem of animals being left in cars in extreme temperatures and prohibit such abuse. Spread awareness, share knowledge.