March in Jaco is the windiest and the hottest month of the year. In March, the weather in Jaco is typically hot. Average daily high temperature in March is about 32 degrees above zero. On average, Jaco has 20 sunny, 9 partly cloudy, and 2 rainy days in March. The rains are usually light. March as well as January and February is considered the most comfortable time to visit Jaco.