In September, the weather in Oloron-Sainte-Marie is typically warm. Average daily high temperature in September is about 21 degrees above zero. On average, Oloron-Sainte-Marie has 22 sunny, 6 partly cloudy, and 2 rainy days in September. The rains are usually light. September as well as July and August is considered the most comfortable time to visit Oloron-Sainte-Marie.