In September, the weather in Punta-Arenas is typically cold. Average daily high temperature in September is about 7 degrees above zero. On average, Punta-Arenas has 13 rainy, 11 cloudy, 3 sunny, and 3 partly cloudy days in September. The rains are usually light. September as well as January, February, March, and April is considered the most uncomfortable time to visit Punta-Arenas.