Planning for the weather is an important factor for making your trip to Sanxenxo a success, especially when you’re splurging. The hottest months are usually August and July with an average temp of 66°F, while the coldest months are February and January with an average of 49°F. The rainiest months in Sanxenxo are October, December, November, and January, with each month seeing an average of 9 inches of rainfall.