January in Bacchus Marsh is the sunniest and the warmest month of the year. In January, the weather in Bacchus Marsh is typically warm. Average daily high temperature in January is about 24 degrees above zero. On average, Bacchus Marsh has 15 sunny, 12 partly cloudy, 3 rainy, and 1 cloudy day in January. The rains are usually light. January as well as December is considered the most comfortable time to visit Bacchus Marsh.