March in Oslo is the sunniest month of the year. In March, the weather in Oslo is typically cold. Average daily high temperature in March is about 3 degrees above zero. On average, Oslo has 10 sunny, 10 partly cloudy, 7 cloudy, 2 rainy, and 2 snowy days in March. The rains are usually moderate. March as well as April, May, October, and November is considered the most uncomfortable time to visit Oslo.