In April, the weather in Hailey is typically cold. Average daily high temperature in April is about 5 degrees above zero. On average, Hailey has 10 partly cloudy, 9 sunny, 5 snowy, 4 cloudy, and 2 rainy days in April. The snowfalls are usually moderate. April as well as February, March, May, and October is considered the most uncomfortable time to visit Hailey.