Ocean temperatures remain warm early in October when water temperatures are close to 22 C (72 F), however, temperatures fall to 19 C (66-67 F) near the end of this month.
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Barcelona weather in October is very warm with an average high of 21°C. At night, temperatures lower to 12°C, so take a jacket with you if you're planning an evening out in the city. It's not very humid in autumn, which makes the warm weather more enjoyable.
In October the ocean temps can be quite warm BUT if there's a hurricane the ocean temp can drop by 10 degrees instantly. The mid/end of Sept. ocean temp w/out hurricanes is about 87 degrees. It starts to cool off and probably should be about 80 degrees in early/mid October, depending on hurricanes.
I definitely think it will be warm enough for sea swimming. Many of the hotel/apartment pools are heated otherwise they might colder than the sea if not in direct sun. You might be mindful of the strength of the sun in Oct with young children.
The weather in Barcelona in OctoberThe average high during the day is 23ºC (73ºF), so you can still wear a T-shirt at midday. At night, temperatures are lower, with an average low of 17ºC (62ºF). You'll need a jumper or thin jacket, but you can safely leave your winter jacket home.
Barcelona has beautiful beaches for days, but each of them offers something a little different. Some are lively, buzzing beaches with basketball courts and ping pong; others are quiet and serene, perfect for when you need a break from all the rest of it.
Barcelona in November is generally cool and pleasant. The temperature ranges between a high of 18ºC and a low of 12º. The water temperature is generally cool owing to the shifting weather in Barcelona in November. So if you're okay with swimming in cold waters, you can try it out.
Spring and Fall are cooler and dressing in layers will help you cope with the temperature changes. But note that whilst it may seem warm and pleasant on a sunny day, the locals won't be in shorts. If you want to blend in then dress as they do – with long pants, sweater, scarf and a jacket with sturdy shoes or boots.
The island's desert-like climate means whatever time you decide to visit, it's almost always warm enough to swim and get a tan. In October and November, daytime temperatures vary between 22°C and 27°C, and the Atlantic Ocean stays at 19-22°C year-round.
Barcelona is an expensive city to visit in Spain, but it's considered semi-affordable in Europe. Comparing Spain's top two destinations, Barcelona is, on average, more expensive than the capital, Madrid. For a mid-range budget traveler, you can expect to spend approximately: $150 per day in Barcelona.
As a general statement, we can say that the pool season for most areas of Andalucia run from mid-May to early October. The high mountains of Andalucia like High Alpujarras have a short pool season since thay are at an altitude of 1,300 metres above sea level.