August in the high Pyrenees is not the Mediterranean people pack for. At 2,000 metres the highs barely reach 12 degrees, mornings drop to 4, and mid-week brings around 8 millimetres of rain on gusty showers. Bring a proper shell and a warm layer. A sun hat alone won't cut it up here. The wind is the real tell, not the number on the thermometer.
Waterproof shell jackets ↗