January in Swansea is the windiest, the sunniest, and the warmest month of the year. In January, the weather in Swansea is typically warm. Average daily high temperature in January is about 20 degrees above zero. On average, Swansea has 16 partly cloudy, 11 sunny, and 4 rainy days in January. The rains are usually light. January as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Swansea.