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1 Average monthly temperatures have a variation of 16 C (28.8 F) which is a slightly low range. 2  The range/ variation of diurnal average temperatures is 6.8 C (12.2 F). 3  The warmest month (July) is fairly hot with a mean temperature of 25 degrees Celsius (77 degrees Fahrenheit). The range/ variation of diurnal average temperatures is 6.8 C (12.2 F). 2  The warmest month (July) is fairly hot with a mean temperature of 25 degrees Celsius (77 degrees Fahrenheit). 3  The coolest month (January) is a little cool having a mean temperature of 9 degrees Celsius (48.2 degrees Fahrenheit).
From October to April temperatures average around 33Â°C. Winters (June-August) are mild, with average daily July temperatures around 27Â°C. Overnight temperatures rarely fall below 5Â°C at any time of year. The average annual rainfall is 532 mm but sometimes no rain falls for months.t can also be humid at this time with an average humidity of 65 per cent. Average maximum temperatures in the winter months (June-August) are around 16Â°C. Sydneyâs rainfall is highest between March and June.