Sydney in September
In September, Sydney has 49.1 mm (1.93 in) of rain, a daily high of 21.1 °C (70.0 °F) and a daily low of 11.9 °C (53.4 °F), as 1991-2020 model estimates; figures in brackets are converted. The daily high is a model estimate, adjusted against station records.
Last updated : first sourced version.
Best time to visit Sydney: September meets our rule. Expect 5.0 rain days (model estimate) and days that grow by 1 h 00 min.
What September is like in Sydney
- Pink, yellow and white paper daisies spread like a carpet at the Australian Botanic Garden Mount Annan. They bloom from September to the end of October. Source: Botanic Gardens of Sydney: Best gardens to visit this spring, checked .
- Bright kites, big and small, fly over Bondi Beach every September at the Festival of the Winds. There are kite-making workshops too. Source: Sydney.com (Destination NSW): Sydney in spring, checked .
- Migratory shorebirds that breed as far away as Japan or Siberia can be seen at Sydney Olympic Park in September. They stay from August until March. Source: Sydney Olympic Park Authority: Flora and fauna, checked .
Key figures
Weather in September, 1991-2020 model estimates
- Daily high
- 21.1 °C (70.0 °F)
- Daily low
- 11.9 °C (53.4 °F)
- Rain
- 49.1 mm (1.93 in) in the month
- Sunshine
- no data
Model estimate 1991-2020, not a weather station: ERA5-Land model estimates (Copernicus), computed by City by Month for the grid cell nearest the city. Daily high and Days with rain: model estimate, adjusted against station records. Licence: CC BY 4.0. Checked . How we make and test model estimates
Model estimate for the ERA5-Land grid cell at 33.9° S, 151.2° E, 4 km from the city centre point.
How we define and convert these figures
Notes. Sunshine: Not in our ERA5-Land estimates.
Daylight on 15 September 2026
- Sunrise
- 05:55 local time
- Sunset
- 17:46 local time
- Day length
- 11 h 51 min
Day length 1-30 September: 11 h 23 min to 12 h 23 min, +1 h 00 min.
Source: NOAA Solar Calculator equations, checked .
Month by month
Each month: daily high in °C, then rain in mm, 1991-2020 model estimates.
ERA5-Land model estimates 1991-2020, as above, checked .
This month against the year
| Measure | September | Rank |
|---|---|---|
| Daily high | 21.1 °C | 5th coldest |
| Daily low | 11.9 °C | 4th coldest |
| Rain | 49.1 mm | driest |
| Sunshine | no data | no data |
| Day length | 11 h 51 min | 6th shortest |
Equal values share a rank. How we rank months
Sydney in September, on average: 5.0 rain days (1 mm or more). Model estimate, adjusted against station records.
ERA5-Land model estimates 1991-2020, as above, checked .
Day length: NOAA solar equations, checked .
Public holidays this month
September 2026: none.
September 2027: none.
Checked against the official list, .
Source: holidays Python library, checked . Library: holidays 0.105.
Same month in 8 model-estimate cities
Sydney is warmer than 1 of our 8 model-estimate cities in September by mean daily high. How we rank cities
Closest high and low in September: Melbourne (3.9 °C apart), Porto (4.3), Istanbul (5.2).
| City | Gap from Sydney, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Sydney (this page) | — | 21.1 | 11.9 | 49.1 | no data |
| Melbourne (closest) | 3.9 | 17.4 | 7.9 | 67.4 | no data |
| Porto (closest) | 4.3 | 25.6 | 15.9 | 59.5 | no data |
| Istanbul (closest) | 5.2 | 25.2 | 18.2 | 49.0 | no data |
| Lisbon | 5.7 | 26.1 | 18.2 | 31.2 | no data |
| Mumbai | 10.9 | 29.8 | 24.9 | no data | no data |
| Bangkok | 12.2 | 32.1 | 25.2 | no data | no data |
| Delhi | 12.5 | 33.7 | 24.2 | no data | no data |
Sources (1991-2020): ERA5-Land model estimates, checked . Each city's page names its grid cell. All sources in full on Methodology.
Sources
- Attribution: Copernicus Climate Change Service (2025): ERA5 Land hourly time-series data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/ee82e357. Accessed on the check date shown. Generated using or contains modified Copernicus Climate Change Service information 2025. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence: CC BY 4.0. Checked .
- NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked .
- holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked .
Cite this page: City by Month. "Sydney in September: weather, daylight, holidays". https://citybymonth.com/cities/australia/sydney/september/. Last updated 8 November 2026.