January in Caloundra is the cloudiest and the warmest month of the year. In January, the weather in Caloundra is typically warm. Average daily high temperature in January is about 25 degrees above zero. On average, Caloundra has 14 rainy, 11 sunny, and 6 partly cloudy days in January. The rains are usually heavy. January as well as February and March is considered the most uncomfortable time to visit Caloundra.