December in Kalutara is the windiest month of the year. In December, the weather in Kalutara is typically hot. Average daily high temperature in December is about 28 degrees above zero. On average, Kalutara has 23 rainy, 4 sunny, 2 cloudy, and 2 partly cloudy days in December. The rains are usually heavy. December as well as March, April, May, and June is considered the most uncomfortable time to visit Kalutara.