In August, the weather in Santiago de Querétaro is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Santiago de Querétaro has 16 rainy, 7 partly cloudy, 6 sunny, and 2 cloudy days in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Santiago de Querétaro.