January in Wollongong is the rainiest, the windiest, and the warmest month of the year. In January, the weather in Wollongong is typically warm. Average daily high temperature in January is about 23 degrees above zero. On average, Wollongong has 12 rainy, 11 sunny, and 8 partly cloudy days in January. The rains are usually heavy. January as well as February and June is considered the most uncomfortable time to visit Wollongong.