Sydney Best Times:
• October-November (Spring): Perfect weather (18-24°C), jacaranda trees blooming, fewer crowds than summer
• March-April (Autumn): Still warm (18-23°C), after summer crowds, beautiful clear days
• Avoid: January-February if you dislike crowds and extreme heat (sometimes 35-40°C)
Melbourne Best Times:
• March-May (Autumn): Mild weather (15-23°C), fewer rainy days, beautiful autumn colors
• September-November (Spring): Pleasant weather (12-22°C), gardens blooming, Spring Racing Carnival
• Avoid: June-August (Winter) unless you enjoy cold, rainy weather (6-14°C, frequent rain)
Brisbane Best Times:
• April-October (Autumn through Spring): Perfect weather (15-26°C), minimal humidity, sunny
• June-August (Winter): Brisbane's secret weapon—beautiful 20-25°C days when Sydney/Melbourne are cold
• Avoid: December-February if you're sensitive to heat/humidity (30-35°C, high humidity, occasional storms)
Overall Winner for Year-Round Visits: Brisbane—even its "worst" months (summer) are manageable, while its winter is arguably Australia's best city weather.