 Average day temperatures during winter months are between 6 °C and 12 °C, and rarely dip below 2 °C.Night temperatures tend to be much cooler, dropping off anywhere from 10 to 20 degrees after the sun goes down.Helensburgh often seems like it has its very own climate compared to neighbouring locations, with visitors to the area often commenting that Helensburgh seems to be a couple of degrees colder than Sydney or Wollongong on the same day (especially in winter).