The wettest months in Spain are from September through to January with November (119mm) and December (112mm) seeing the most rain. April can also be quite wet with around 96mm. As a rule of thumb, the further north you are towards the Atlantic coast, the more rain you are going to get.
What are the rainiest months in Barcelona?
Barcelona's climateThe rainiest season in the year by far is autumn (above all, the months of September and October) followed by spring and winter, whereas the driest is summer, with rainfall at its lowest during the months of June and July. The temperature range is moderate.
When to visit Madrid?
The best time to visit Madrid is in the fall (September to November) or spring (March to May), when balmy temps blow through the city, making it come alive. But if you don't mind layering up or experiencing a toned down Madrid, visit in the winter when hotels reduce their rates.