You're probably asking about the best time to visit Adelaide itself, not just the airport. For a comfortable and enjoyable trip, the best times to visit Adelaide are during autumn (March to May) and spring (September to November).
Autumn in Adelaide offers pleasant, mild weather with average temperatures ranging from 15Β°C to 25Β°C. This is a wonderful time to explore the city's parks and gardens, such as the Adelaide Botanic Garden, or to take a day trip to the nearby Adelaide Hills for wine tasting without the summer heat. It's also when many of Adelaide's festivals take place, like the Adelaide Fringe, which brings a fantastic energy to the city.
Spring is equally lovely, with temperatures between 15Β°C and 25Β°C, and the city's flora is in full bloom. It's superb for outdoor activities, whether you're strolling along the River Torrens or visiting the coastal suburbs like Glenelg for a relaxed beach day. The warmer days are ideal for exploring the surrounding wine regions, such as the Barossa Valley or McLaren Vale, which are just a short drive away.
While summer (December to February) can be quite hot, with temperatures often exceeding 30Β°C, it's still a popular time for those who enjoy the beach and outdoor events. Winter (June to August) is cooler and wetter, with temperatures around 10Β°C to 15Β°C, but it can be a good time for cosy indoor activities like visiting museums or enjoying the city's culinary scene.