CLIMATE: AVERAGE MONTHLY WEATHER IN Sydney, Australia. Sydney has a humid subtropical climate meaning mild cool winters and hot summers. Rain and sunshine is spread out evenly throughout the year. Summer in Sydney starts in December and lasts until the end of March.What is the average temperature in Sydney Australia?
Average Weather in Sydney Australia. In Sydney, the summers are warm and partly cloudy and the winters are short, cool, and mostly clear. Over the course of the year, the temperature typically varies from 47°F to 80°F and is rarely below 42°F or above 90°F.What is the weather like in Sydney Australia in December?
Climate in Australia in December. In Sydney the weather is ideal for sunbathing on bright beaches like Bondi in temperatures topping out at around 25°C (77°F), while across the other side of the continent in Perth the mercury regularly approaches 30°C (86°F). Melbourne is a little cooler than Sydney.