What are the weather and precautions for traveling to Australia from the end of April to May Day?

If you are not very rich, live in YHA and eat casually, and the price is similar. Adelaide is ok, not big, but the scale of Chinatown is relatively large in Australia. There are many places to visit in Sydney and Melbourne, so I have time to visit the aquarium in Sydney. These three places are all in southern Australia, and it will be cold in May. It is best to bring clothes that are convenient to put on and take off, and the temperature difference is relatively large. Every city has shops and duty-free shops. There are many big brands in these places, and they are cheaper than in China. Instead, they don't think things at the airport are cheaper. It is also a good choice to buy a copy of Lonely Planet Australia. Not afraid of getting lost, hehe.