February in Porto Alegre is the rainiest and the hottest month of the year. In February, the weather in Porto Alegre is typically hot. Average daily high temperature in February is about 29 degrees above zero. On average, Porto Alegre has 15 rainy, 11 sunny, and 3 partly cloudy days in February. The rains are usually heavy. February as well as January is considered the most uncomfortable time to visit Porto Alegre.