Barcelona weather in July is very warm and sunny, making it a great time to visit if you want to enjoy a beautiful climate on holiday. You can look forward to long days filled with high temperatures, bright sunshine and not much chance of rain.
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Summers in Barcelona are hot during the day and cooler at night-time. During the months of July and August the average highs are between 83°F (28°C) and 84°F (29°C). The average lows are of 73°F (22°C) and 73.6°F (23°C). It is not very usual for it to rain during the summer.
July Barcelona weather has an average temperature between 24-25 °C (74-77 °F) and it slowly rises to about 26-27 °C (79-81°F) at the end of the month. Expect 10 hours of daily sunshine and about 2 days of rainfall – a one in 15 chance of getting rained on!
As a coastal city at the Mediterranean, Barcelona has a Mediterranean climate. In the summer months the Azores high dominates the weather. It is warm, quite hot in summer, and dry.
The hottest place in Spain in July is Seville (36ºC). Along with the cities of Cordoba and Granada, it sits in what's known as the “Iberian oven”, heated by dry summer winds from the Sahara Desert.
As I mentioned, it's hot and sticky in Barcelona. I suggest you stay away from jeans because they're too thick. If you must wear pants, choose a light material so you don't get all sweaty. Also, they're lighter and more compact to pack.
Summers can be hot and humid, with long days and plenty of sunshine. So loose-fitting, flowing and natural fibers will get you far. By the beaches and small fishing villages of the Costa Brava, beachwear reigns supreme and you should pack casual and comfortable clothing.
The best time of year to visit Spain is in the spring and early summer (April-June) and fall (September-October) for abundant activities, good weather, and fewer tourists.
The pollutants considered most harmful to human health in Barcelona are fine particulate matter (PM2.5 and PM10) and nitrogen dioxide (NO2), pollutants attributed to urban and regional traffic.