April in Smithers is the windiest month of the year. In April, the weather in Smithers is typically cold. Average daily high temperature in April is about 6 degrees above zero. On average, Smithers has 9 cloudy, 8 partly cloudy, 7 rainy, 5 sunny, and 1 snowy day in April. The rains are usually moderate. April as well as March, May, June, and July is considered the most uncomfortable time to visit Smithers.