April in Irun averages a daily high of 18.3°C with nights around 9.8°C. Expect roughly 15.3 wet days totalling 125.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Irun is May–October.
Based on SAN SEBASTIAN FUENTERRABIA, SP (2.4km), 1995–2024. 26 years of April data.