Overview: SantanderSantander (Spain) in general has a hot climate. Temperatures during the day are in the range from 13 °C (55 °F) in January to 23 °C (74 °F) in August. Temperatures during the night go from 7 °C (44 °F) in January to 17 °C (63 °F) in July. The least rainy month in Santander is July with its 8 days of rain, the rainiest month is November, when it rains 14 days. The highest sea temperatures in Santander are in August with 21 °C (70 °F) and the lowest in February with 12 °C (54 °F).