The UK has a higher level of humidity than the European continent and “it is harder for the human body to keep cool as your sweat doesn't evaporate as quickly.”

When comparing the humidity of the United Kingdom and Spain, the answer depends largely on whether you are looking at relative humidity or absolute humidity (dew point). On average, the UK has a much higher relative humidity than Spain, frequently hovering between 70% and 90% year-round due to its maritime climate and frequent rainfall. In contrast, many parts of inland Spain, such as Madrid or Seville, experience very low relative humidity, especially during the scorching summer months when the air can become exceptionally dry. However, coastal regions of Spain, such as Barcelona or Valencia, can feel much "muggier" than the UK during the summer because high temperatures combined with moisture from the Mediterranean create a high dew point, making it harder for the body to cool down through sweat. In the UK, while the air is technically "moist," the lower temperatures mean it rarely feels "oppressive" in the way a humid Spanish coastal summer does. Therefore, while the UK is statistically wetter and more humid on paper, Spain can often feel more uncomfortably humid in its coastal tourist hubs during the peak of summer heat.