Adelaide weather in September
September in Adelaide: cool, a little rain, with clean air — an excellent time to visit.
#8 of 12 months in Adelaide · #188 of 604 destinations to visit in September · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Adelaide climate normals — September
| Daytime high | 17°C / 63°F | 🙂 cool |
|---|---|---|
| Nighttime low | 10°C / 51°F | |
| Feels like (high) | 15°C / 59°F | |
| Rainfall | 44 mm / 1.7 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 8°C / 46°F | |
| Sunshine | 9.9 h/day | |
| Daylight | 11.9 h | |
| Wind | 25 km/h / 15 mph | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Adelaide in September — FAQ
- Is September a good time to visit Adelaide?
- September in Adelaide: cool, a little rain, with clean air — an excellent time to visit. It ranks #8 of 12 months for Adelaide on SeasonMap's comfort score (85/100).
- What is the weather like in Adelaide in September?
- In September, Adelaide averages a daily high of 17.4°C and a low of 10.4°C, with about 44.4 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Adelaide in September?
- Adelaide has a mean US Air Quality Index of about 28 in September.