January in Forster is the warmest month of the year. In January, the weather in Forster is typically warm. Average daily high temperature in January is about 25 degrees above zero. On average, Forster has 12 sunny, 11 rainy, and 8 partly cloudy days in January. The rains are usually heavy. January as well as February, April, and June is considered the most uncomfortable time to visit Forster.