Sydney weather in September
In September, Sydney has an average high of 19 °C67 °F and an average low of 13 °C56 °F, with about 43 mm1.7 in of precipitation. It is the 9th warmest month of the year and the driest.
How September compares with other months
Compared with August, September is 2.1 °C3.7 °F warmer on average. Compared with October, September is 1.9 °C3.3 °F cooler on average and drier by 21 mm0.8 in. Daylight lasts about 11.9 hours around the middle of the month. Average relative humidity is 68% and the average cloud amount 47%.
Is September a good time to visit Sydney?
Yes — September is one of the most comfortable months to visit Sydney by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in September
For Sydney in September, pack light layers — T-shirts plus a light sweater or jacket.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Sydney | 1967 | 1356 | 431.7 |
| Liverpool | 2171 | 847 | 491.9 |
| Central Coast | 2170 | 1253 | 441.7 |
| Richmond (New South Wales) | 2272 | 1049 | 471.8 |
| Wollongong | 2069 | 1051 | 451.8 |
| Newcastle | 2068 | 1457 | 522.1 |
| Nowra | 1967 | 1153 | 491.9 |
| Maitland | 2373 | 1049 | 411.6 |
| Orange | 1660 | 439 | 421.6 |
Nearby places that are more than 1 °C1.8 °F cooler: Liverpool, Wollongong and Orange.
Other months in Sydney
- January25 °C78 °F / 20 °C68 °F
- February25 °C77 °F / 20 °C69 °F
- March24 °C75 °F / 19 °C67 °F
- April22 °C71 °F / 17 °C63 °F
- May19 °C67 °F / 15 °C58 °F
- June17 °C63 °F / 13 °C55 °F
- July16 °C61 °F / 11 °C52 °F
- August17 °C63 °F / 12 °C53 °F
- September19 °C67 °F / 13 °C56 °F
- October21 °C70 °F / 15 °C59 °F
- November23 °C73 °F / 17 °C62 °F
- December24 °C75 °F / 18 °C65 °F
Frequently asked questions
How warm is Sydney in September?
In September the average high in Sydney is 19 °C (67 °F) and the average low is 13 °C (56 °F).
Does it rain a lot in Sydney in September?
On average about 43 mm (1.7 in) of precipitation falls in September; it ranks 12th of the 12 months.
Is September the warmest month in Sydney?
No. The warmest month in Sydney is January, with an average high of 25 °C (78 °F). The coldest month is July, with an average low of 11 °C (52 °F).
How long is the day in Sydney in September?
In the middle of September the day in Sydney lasts about 11.9 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Sydney in September?
The average relative humidity in September is about 68%. This is a long-term average for the whole day.
How cloudy is Sydney in September?
On average about 47% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.