During summer try to exercise your dog during the coolest part of the day- early morning is the best or at dusk. Sprinkle some water on you dog after the walk so he cools down. Have 2 or 3 water bowls spread around the backyard so if sun rotates at least 1 of them is in a shady spot. You can put few ice cubes or an ice block inside your dog water bowl before you leave to work. They love it if on a hot day you put a filled kong in the freezer and you leave it out for them so they'll be busy licking it away and it'll be very refreshing for them, like an icy pole. In very intense heat - 36 C check if possible to leave your dog indoors in a cool area or to have someone to come to check him for you middle of the day and to cool him down.
Beach off leash areas summer regulations are now on. It started from 1 November. Please check you local Council website for permitted times and hours. Fines are expensive and council beach inspectors do patrol the beaches in summer in motorbikes. Have a happy summer!