I think the winter is the best time for photography in this area (except for photographing vines which are boring at the moment). The clouds are more interesting, the area is green, the streams are running, and the sunsets and sunrises are better. Importantly sunrise is 7:15am not 5:15am! Also as the sun rises in winter further north, it will light up the coast in Geographe Bay, whereas in summer it rises inland.
Here is shot of a stormy day at Bunker Bay.