December in São Tomé is the sunniest month of the year. In December, the weather in São Tomé is typically warm. Average daily high temperature in December is about 27 degrees above zero. On average, São Tomé has 22 rainy and 9 sunny days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit São Tomé.