The highest day temperature in September 2026 was 77°F. The lowest night temperature was 53°F. The average values for day and night temperatures during September were 65.9°F и 60.6°F respectivly.

The average sea surface temperature in September 2026 for Sydney was 65.3°F. The maximum and minimum values were 63.6°F and 67.0°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Sydney is 1.0 in. It makes september the least rainy month of the year.

The average wind speed in September is 10.9 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Sydney in September is 8.4 hours.