January in Valletta is the rainiest and the windiest month of the year. In January, the weather in Valletta is typically warm. Average daily high temperature in January is about 15 degrees above zero. On average, Valletta has 17 sunny, 10 rainy, and 4 partly cloudy days in January. The rains are usually light. January as well as February is considered the most uncomfortable time to visit Valletta.