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A heatwave is a period of abnormally hot weather that lasts for three or more days. In Sydney, a heatwave is defined as three or more consecutive days.
Sydney's weather forecast for September 2026 shows a warm week ahead with potential heatwave conditions, the Bureau of Meteorology has warned.
Sydney summers are warm and humid, with average maximum temperatures ranging from 26 degrees Celsius in December to 29 degrees Celsius in February.
The Bureau of Meteorology has forecast clear conditions across the city, providing ideal viewing conditions for the festival's outdoor installations.
The city's western suburbs have received below-average rainfall, while the coastal areas have experienced more typical precipitation levels.