Sydney is a great place to visit year-round, but the best time to visit really depends on what you're looking for. For warm, sunny weather and outdoor activities, the summer months from December to February are the most popular. Spring (September to November) and autumn (March to May) offer milder temperatures and less crowded attractions, making them great times to visit as well. Winter (June to August) can be chilly and rainy, but it's also the best time to enjoy the city's cultural offerings, like festivals and museums.