I went to Cairns, Australia, to visit the Great Barrier Reef at the beginning of the month. Is the temperature suitable for going in the water at that time?

The four seasons are opposite to those in China. Spring and autumn are the rainy seasons. The sea temperature of the Cairns Great Barrier Reef is 25 degrees in summer and 19 degrees in winter. Summer is from December to February, which is the best time to travel. The temperature is about 33 degrees during the day and 25 degrees at night. It is about 23 degrees Celsius during the day and 18 degrees Celsius at night in winter. The situation in Brisbane is similar to Cairns, a little colder than Sydney, 30-20 degrees Celsius in summer and 8-15 degrees Celsius in winter.