Tasmania is cooler year-round: while weather in the highlands is unpredictable at all times, summer is a reliable time to explore the island’s outdoor attractions. As a result, the best time to visit Australia depends on where exactly you plan to go. In the coastal tropics, weather basically falls into two seasons. The best time to visit is during the hot and cloudless Dry (from April to Nov), with moderate coastal humidity maintaining a pleasant temperature day and night and cooler nights inland.