August in Kościelisko is the warmest month of the year. In August, the weather in Kościelisko is typically warm. Average daily high temperature in August is about 21 degrees above zero. On average, Kościelisko has 16 rainy, 8 partly cloudy, and 7 sunny days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Kościelisko.