March in Port Alberni is the rainiest and the cloudiest month of the year. In March, the weather in Port Alberni is typically cold. Average daily high temperature in March is about 5 degrees above zero. On average, Port Alberni has 30 rainy and 1 sunny day in March. The rains are usually heavy. March as well as January, February, April, and May is considered the most uncomfortable time to visit Port Alberni.