With only 55 days of rain a year on average, and mild temperatures year-round, Barcelona has some of the best weather you can find anywhere in the world. On Spring, the weather is mild but a little bit unpredictable. During summer, the weather is hot and humid. Bring lightweight linen or cotton clothing and T-shirts for the summer months. During Autumn, the temperature starts to get cooler, but you can still enjoy sunny and warm weather some days. In winter, the weather is generally cool and sometimes cold and windy, but there are still sunny and mild days. Make sure to bring winter clothing, and an umbrella for rainy days.