August in Irun averages a daily high of 26.3°C with nights around 18°C. Expect roughly 11.8 wet days totalling 102mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Irun is May–October.
Based on SAN SEBASTIAN FUENTERRABIA, SP (2.4km), 1995–2024. 24 years of August data.