April in Thiruvananthapuram is the hottest month of the year. In April, the weather in Thiruvananthapuram is typically hot. Average daily high temperature in April is about 29 degrees above zero. On average, Thiruvananthapuram has 21 rainy, 7 sunny, and 2 partly cloudy days in April. The rains are usually heavy. April as well as May, June, July, and August is considered the most uncomfortable time to visit Thiruvananthapuram.