January in Adelaide is the sunniest and the warmest month of the year. In January, the weather in Adelaide is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Adelaide has 25 sunny, 4 partly cloudy, and 2 rainy days in January. The rains are usually moderate. January as well as February, March, October, and November is considered the most comfortable time to visit Adelaide.