To me the beach is far more atmospheric in winter, with the wind howling and the waves sloshing in, dark and ominous. I love to walk along the coast, all rugged up in Icebreaker, polar fleece, scarf and beanie, watching the play of light on water and sand. Seabirds diving in. Very few people and no sunbathers.
This photo was taken at Phillip Island in March, so not really winter, but it was a cool and thundery day, so almost as good!