Climate averages 1991–2020
Adelaide weather
in September.
A mild, moderately wet month: the 9th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Adelaide: daytime highs average 17.0°C and nights cool to about 9.7°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 53 mm of rain on roughly 10 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 51 min on an average September day.
The nearest other city in this atlas is Adelaide Hills (10 km away). In September its highs average 15.1°C, 1.8°C cooler than Adelaide, with 55 mm of rain.
Among the 32 cities listed in Australia, Adelaide ranks 21st of 32 for the warmest September highs and joint 20th of 32 for the driest September (rainfall, lowest first). The mean September high of those 32 cities is 20.0°C; Adelaide is 3.0°C cooler than that mean.
From September to October, average highs rise by 3.1°C to 20.1°C, and monthly rainfall falls from 53 mm to 35 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
Adelaide climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.7°C16.6°C | 16.6°C | 19 | 3.3 | 14.214 h |
| February | 27.5°C16.8°C | 16.8°C | 19 | 2.7 | 13.413 h |
| March | 24.8°C15.2°C | 15.2°C | 19 | 3.5 | 12.312 h |
| April | 21.2°C13.2°C | 13.2°C | 36 | 5.6 | 11.211 h |
| May | 17.4°C11.0°C | 11.0°C | 52 | 8.3 | 10.310 h |
| June | 14.5°C9.0°C | 9.0°C | 61 | 9.6 | 9.810 h |
| July | 13.7°C8.2°C | 8.2°C | 64 | 10.4 | 10.010 h |
| August | 14.6°C8.3°C | 8.3°C | 58 | 10.8 | 10.811 h |
| September, selected | 17.0°C9.7°C | 9.7°C | 53 | 9.8 | 11.812 h |
| October | 20.1°C11.2°C | 11.2°C | 35 | 6.4 | 12.913 h |
| November | 23.1°C13.3°C | 13.3°C | 30 | 5.3 | 13.914 h |
| December | 25.3°C15.0°C | 15.0°C | 25 | 4.8 | 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
- Adelaide Hills in SeptemberAustralia · 10 kmHigh 15.1°C · Low 7.2°C · 55 mm rain
- Bendigo in SeptemberAustralia · 551 kmHigh 15.5°C · Low 6.6°C · 52 mm rain
- Ballarat in SeptemberAustralia · 555 kmHigh 13.4°C · Low 5.4°C · 69 mm rain
- Geelong in SeptemberAustralia · 627 kmHigh 15.7°C · Low 8.2°C · 49 mm rain
- Melbourne in SeptemberAustralia · 654 kmHigh 16.1°C · Low 7.9°C · 60 mm rain
- Canberra in SeptemberAustralia · 958 kmHigh 14.9°C · Low 4.0°C · 51 mm rain
- Sydney in SeptemberAustralia · 1162 kmHigh 19.4°C · Low 11.5°C · 50 mm rain
- Newcastle, Australia in SeptemberAustralia · 1235 kmHigh 20.0°C · Low 12.8°C · 53 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 Adelaide) is explained once on the Adelaide year overview and on the Sources, method and limits page.