In October, the weather in Karlskrona is typically warm. Average daily high temperature in October is about 11 degrees above zero. On average, Karlskrona has 12 rainy, 11 cloudy, 4 sunny, and 4 partly cloudy days in October. The rains are usually moderate. October as well as January, February, November, and December is considered the most uncomfortable time to visit Karlskrona.