In September, the weather in Punta-Arenas is typically cold. Average daily high temperature in September is about 8 degrees above zero. On average, Punta-Arenas has 12 rainy, 9 partly cloudy, 5 sunny, and 4 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.