In April, the weather in Seinäjoki is typically cold. Average daily high temperature in April is about 6 degrees above zero. On average, Seinäjoki has 14 rainy, 10 cloudy, 5 sunny, and 1 partly cloudy day in April. The rains are usually light. April as well as March, August, October, and November is considered the most uncomfortable time to visit Seinäjoki.