April in Carlsbad is the windiest and the sunniest month of the year. In April, the weather in Carlsbad is typically warm. Average daily high temperature in April is about 27 degrees above zero. On average, Carlsbad has 23 sunny, 5 partly cloudy, and 2 rainy days in April. The rains are usually light. April as well as March and November is considered the most comfortable time to visit Carlsbad.