Below is the official Adelaide weather forecast from the Australian Government Bureau of Meteorology.
Adelaide weather is considered a mediterranean climate with hot, dry summers and mild, wet winters. And the capital of South Australia is also the driest of all capital cities. During the summer don’t expect much rainfall. It’s light and infrequent with around 20 millimetres on average in the summer months of January and February. That said, it’s not uncommon for completely rain free months during the summer. In fact, in 1893 no rain fell for 69 days. Winter weather in Adelaide can be quite wet, with June being the wettest month. On average around 80mm falls in that month. Temperatures in Adelaide are also dependent on the seasons. In summer the maximum average is 29 C (84 F in the old scale) but extreme heat is not uncommon. Adelaide residents can usually expect about three days a year minimum when temperatures exceed 40C - or above. Adelaide’s typically mediterranean climate can also see some very extreme temperatures with 46.1C recorded in 1939. In 2008, the city recorded 15 consecutive days in excess of 35C - a record for an Australian capital city.
Temperatures in winter are more manageable. The winter months of June- August the maximum average is 14-15C with a minimum of around 8C. You will rarely feel a frost in Adelaide, the last major one of record was 1982. And snow does not fall during winter - although in the nearby Adelaide Hills there is the occasional winter dusting.