April in Santander averages a daily high of 15.9°C with nights around 10°C. Expect roughly 13.1 wet days totalling 76.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Santander is June–October.
Based on SANTANDER CMT, SP (2.9km), 1995–2024. 29 years of April data.