In August, the weather in Port-Stenli is typically cold. Average daily high temperature in August is about 5 degrees above zero. On average, Port-Stenli has 18 cloudy, 6 rainy, 4 partly cloudy, and 3 sunny days in August. The rains are usually light. August as well as February, April, May, and June is considered the most uncomfortable time to visit Port-Stenli.