Day 10: Bilbao to Portugalete – 8.32 miles (13.38 km)

Today marked Bilbao’s hottest day of the heatwave, with temperatures soaring to 99°F (37°C).

We set out early, starting our walk at 8:15 AM to ensure we reached Portugalete before the midday heat set in. Fortunately, it was a short hike—just eight miles—and much of the route followed the river. The water and occasional breeze made the rising heat a bit more bearable.