April in Hayward is the windiest month of the year. In April, the weather in Hayward is typically warm. Average daily high temperature in April is about 11 degrees above zero. On average, Hayward has 9 sunny, 8 rainy, 6 cloudy, 6 partly cloudy, and 1 snowy day in April. The rains are usually heavy. April as well as March, May, October, and November is considered the most uncomfortable time to visit Hayward.