October in Mar del Plata is the rainiest month of the year. In October, the weather in Mar del Plata is typically warm. Average daily high temperature in October is about 18 degrees above zero. On average, Mar del Plata has 10 rainy, 9 sunny, 8 partly cloudy, and 4 cloudy days in October. The rains are usually moderate. October as well as June, July, August, and September is considered the most uncomfortable time to visit Mar del Plata.