August in Bilbao averages a daily high of 26.4°C with nights around 16.3°C. Expect roughly 10.1 wet days totalling 49.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Bilbao is May–October.
Based on BILBAO AEROPUERTO, SP (4.2km), 1995–2024. 30 years of August data.