The climate throughout the year is quite nice in Bilbao, Spain. Average low temperatures range from the low 40s during the winter months of December and January to the upper 70s during the late summer in July and August. Average precipitation remains relatively constant throughout the year, although late fall and early winter tend to be the times that receive the most rain. If you want to avoid the crowds, then try to avoid traveling to Bilbao (and the rest of Spain, or Europe, for that matter) during July and August, when tourists trample across the continent. To avoid the tourist rush, consider traveling to Bilbao during the spring or early fall, when crowds are at their lightest.

Bilbao Weather - 5 Day Forecast