South Australia weather in September
September is a fair month to visit South Australia: highs of 18°C (64°F) and about 47 mm (1.9 in) of rain on average. Nights average 8°C (46°F) and cloud cover 46% (NASA POWER, 2001–2025 averages). The sea averages 15°C (58°F). It is the 5th wettest month of the year and the 4th coolest. Compared with August, it is warmer and about as wet; October brings highs of 21°C (70°F) and 24 mm (0.9 in) of rain.
Figures are long-term averages for Adelaide, the largest city in South Australia. See below for other places.
Is September a good time to visit South Australia?
fair month Weather score 76/100.
September is a fair month in South Australia. The weather is usually best in Oct–Apr.
Does it rain a lot in South Australia in September?
No, it is usually dry: about 47 mm (1.9 in) falls in an average September. It is the 5th wettest month of the year.
How warm is South Australia in September?
Days average 18°C (64°F) and nights 8°C (46°F).
South Australia weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 30°C (85°F) | 16°C (60°F) | 15 mm | 37% | 23°C (74°F) | best |
| February | 29°C (83°F) | 15°C (59°F) | 17 mm | 38% | 23°C (74°F) | best |
| March | 26°C (79°F) | 14°C (57°F) | 25 mm | 39% | 23°C (74°F) | best |
| April | 22°C (72°F) | 11°C (53°F) | 34 mm | 45% | 20°C (68°F) | best |
| May | 18°C (64°F) | 9°C (48°F) | 53 mm | 47% | 17°C (62°F) | fair |
| June | 14°C (58°F) | 7°C (44°F) | 60 mm | 47% | 14°C (57°F) | least pleasant |
| July | 14°C (57°F) | 6°C (43°F) | 60 mm | 46% | 13°C (55°F) | least pleasant |
| August | 15°C (58°F) | 6°C (43°F) | 51 mm | 46% | 13°C (55°F) | least pleasant |
| September | 18°C (64°F) | 8°C (46°F) | 47 mm | 46% | 15°C (58°F) | fair |
| October | 21°C (70°F) | 9°C (49°F) | 24 mm | 46% | 18°C (64°F) | best |
| November | 25°C (77°F) | 12°C (53°F) | 22 mm | 46% | 19°C (67°F) | best |
| December | 27°C (81°F) | 14°C (57°F) | 23 mm | 43% | 22°C (71°F) | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months
Weather across South Australia in September
Weather can differ a lot within South Australia: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Adelaide | 18°C (64°F) | 8°C (46°F) | 47 mm | fair |
| Adelaide Hills | 18°C (64°F) | 8°C (46°F) | 47 mm | fair |
| Mount Gambier | 15°C (59°F) | 9°C (49°F) | 69 mm | least pleasant |
| Morphett Vale | 18°C (64°F) | 8°C (46°F) | 47 mm | fair |
| Mount Barker | 18°C (64°F) | 8°C (46°F) | 47 mm | fair |
| Whyalla | 21°C (69°F) | 10°C (50°F) | 29 mm | best |
| Gawler | 19°C (66°F) | 7°C (44°F) | 47 mm | fair |
| Adelaide city centre | 18°C (64°F) | 8°C (46°F) | 47 mm | fair |
| Parafield Gardens | 18°C (64°F) | 8°C (46°F) | 47 mm | fair |
| Paralowie | 18°C (64°F) | 8°C (46°F) | 47 mm | fair |