October in Santander averages a daily high of 20.3°C with nights around 14°C. Expect roughly 13.3 wet days totalling 119mm. 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 October data.