March in Santander averages a daily high of 14.9°C with nights around 8.9°C. Expect roughly 12.3 wet days totalling 80.4mm. 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. 30 years of March data.