March in San Juan del Rio is the windiest month of the year. In March, the weather in San Juan del Rio is typically warm. Average daily high temperature in March is about 21 degrees above zero. On average, San Juan del Rio has 16 sunny, 14 partly cloudy, and 1 rainy day in March. The rains are usually light. March as well as February and April is considered the most comfortable time to visit San Juan del Rio.