October in Uusikaupunki is the rainiest month of the year. In October, the weather in Uusikaupunki is typically cold. Average daily high temperature in October is about 8 degrees above zero. On average, Uusikaupunki has 16 rainy, 6 cloudy, 5 partly cloudy, and 4 sunny days in October. The rains are usually heavy. October as well as April, November, and December is considered the most uncomfortable time to visit Uusikaupunki.