Australia is known for its generally beautiful weather and its fairly stable climate.
Australia experiences winter during the months of June through August. However Australia does not experience temperatures as extremely low as other countries during winter. This is because Australia does not have very high mountains and its coastal regions are surrounded by warming oceans. These warm waters are the breeding grounds for whales, which is why during this season they travel up from the colder waters down south.
The winter climate in Australia is always pleasant and ideal for whale watching. A whale watching cruise seldom, if at all, gets postponed due to bad weather. Even if an operator does have to postpone a cruise to the following day in the unusual case of bad weather, tickets will be transferrable.
Please look at the following links for further weather details:
www.weather.com.au - Australian Weather Online
www.seabreeze.com.au - Wind and Weather forecast
www.bom.gov.au - Bureau of Meteorology