March in San Miguel de Allende is the windiest month of the year. In March, the weather in San Miguel de Allende is typically warm. Average daily high temperature in March is about 22 degrees above zero. On average, San Miguel de Allende 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 Miguel de Allende.