Adelaide weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: October – April
What is the weather like in Adelaide in September?
In September, Adelaide is mild: daytime highs average 17 °C, and nights cool down to about 9 °C. The sea averages 14.1 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 9 days, adding up to 49 mm. All in all, September is an excellent month for a holiday in Adelaide.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 61 | 81 | 94 |
| Day | 15° | 17° | 20° |
| Night | 8° | 9° | 11° |
| Sea | 13° | 14° | 16° |
| Sun | 6 h | 7 h | 8 h |
| Rain days | 10 | 9 | 6 |
More details for September
- Daylight
- 11 h 49 min06:16 – 18:06
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 25 km/haverage daily peakAll months
- Cloud cover
- 47 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+9:30Australia/Adelaide
How the score comes together
- Temperatureweight 50 %94 %
- Sunshineweight 20 %68 %
- Few rainy daysweight 30 %68 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Adelaide in September: quick answers
Is Adelaide hot in September?
No. In September, Adelaide is mild: daytime highs average 17 °C and nights drop to about 9 °C.
Can you swim in Adelaide in September?
Only if you don't mind cold water: in September the sea averages just 14.1 °C. Comfortable swimming is possible from January to March.
Does it rain much in Adelaide in September?
Rain falls on about 9 days, adding up to 49 mm.
Adelaide month by month
The whole year in AdelaideAll destinations: AustraliaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences