The average daily temperature is 28°C and heat waves are quite common at this time of year, with highs reaching up to 36°C. You'll have at least 13 hours of daylight per day with an average humidity of 56%.
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Barcelona is on the sea and has what's called a Mediterranean climate. This means that autumn, spring and winter can be wet, although temperatures stay fairly mild. The summers are hot and dry.
On the other hand, the summers are hot, averaging between 23º and 26 ºC over the months of July and August. Being close to the sea makes Barcelona characteristically muggy over the summer, when maximum temperatures only ever rise above 30 ºC during serious heat waves.
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.”
Bathing season calendar. Beach mid-season: from 1 to 10 April and every weekend in April, from 1 to 26 May and from 12 to 25 September. All beach rescue and first aid facilities on Barcelona's beaches are open to the public from 10.30 a.m. to 6.30 p.m. Beach high season: from 27 May to 11 September.
If you do make it down to Andalusia, expect extreme heat during this month. Temps in inland cities like Seville and Córdoba regularly surpass 100°F (38°C), so you might be better sticking to the coastal cities like Cádiz. Head north to the Atlantic coast and Basque Country for some of the mildest temps.
La Palma (Canary Islands)The greenest and most mountainous of the Canary Islands is cooler on average than the other islands in Spain's Atlantic archipelago, with average summer temperatures on the coast staying below 28C.
Humidity levels in July and August can be uncomfortably high. Mosquitoes are very common throughout the year, with only February and March being relatively bug-free. Mosquitoes bites can cause a severe allergic reaction for some people.
In Barcelona there is not problem to go in July or August, the most of the shops, bars, restaurants, or museums are all open. It's possible that some shops in districts far of centre were closed, but in the centre all are open, Barcelona is a tourist city and, you don't have to worry for that.
Salzburg, Austria. Not many people know but Salzburg in Austria is one of the best cities in Europe where it is warm but not too hot in July and August. Moderate temperatures make Salzburg cool and pleasant with average highs ranging from 21°C (70F) to 25°C (77F).