Climate averages 1991–2020
Sydney weather
in September.
A mild, moderately wet month: the 8th warmest and the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Sydney: daytime highs average 19.4°C and nights cool to about 11.5°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 50 mm of rain on roughly 7 days, which makes September a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 51 min on an average September day.
The nearest other city in this atlas is Central Coast (51 km away). In September its highs average 19.8°C, about as warm as Sydney, with 51 mm of rain.
Among the 32 cities listed in Australia, Sydney ranks 17th of 32 for the warmest September highs and 16th of 32 for the driest September (rainfall, lowest first). The mean September high of those 32 cities is 20.0°C; Sydney is 0.6°C cooler than that mean.
From September to October, average highs rise by 1.9°C to 21.3°C, and monthly rainfall rises from 50 mm to 59 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sydney climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.6°C19.5°C | 19.5°C | 73 | 9.3 | 14.114 h |
| February | 25.0°C19.5°C | 19.5°C | 93 | 10.5 | 13.313 h |
| March | 23.6°C18.2°C | 18.2°C | 81 | 11.7 | 12.312 h |
| April | 21.5°C15.3°C | 15.3°C | 77 | 10.5 | 11.311 h |
| May | 18.7°C12.4°C | 12.4°C | 79 | 9.6 | 10.410 h |
| June | 16.4°C10.4°C | 10.4°C | 97 | 10.1 | 9.910 h |
| July | 15.9°C9.1°C | 9.1°C | 56 | 7.8 | 10.110 h |
| August | 17.1°C9.4°C | 9.4°C | 53 | 6.4 | 10.911 h |
| September, selected | 19.4°C11.5°C | 11.5°C | 50 | 6.7 | 11.912 h |
| October | 21.3°C13.8°C | 13.8°C | 59 | 8.1 | 12.913 h |
| November | 22.6°C15.8°C | 15.8°C | 72 | 9.2 | 13.914 h |
| December | 24.2°C17.8°C | 17.8°C | 60 | 8.7 | 14.414 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Central Coast in SeptemberAustralia · 51 kmHigh 19.8°C · Low 12.9°C · 51 mm rain
- Wollongong in SeptemberAustralia · 68 kmHigh 18.8°C · Low 12.3°C · 59 mm rain
- Blue Mountains in SeptemberAustralia · 83 kmHigh 15.0°C · Low 4.3°C · 53 mm rain
- Newcastle, Australia in SeptemberAustralia · 117 kmHigh 20.0°C · Low 12.8°C · 53 mm rain
- Maitland in SeptemberAustralia · 130 kmHigh 21.6°C · Low 10.9°C · 37 mm rain
- Canberra in SeptemberAustralia · 247 kmHigh 14.9°C · Low 4.0°C · 51 mm rain
- Tuggeranong in SeptemberAustralia · 261 kmHigh 14.9°C · Low 4.0°C · 67 mm rain
- Coffs Harbour in SeptemberAustralia · 436 kmHigh 21.5°C · Low 13.7°C · 43 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sydney) is explained once on the Sydney year overview and on the Sources, method and limits page.