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14 September 2026
Rain in Barcelona doesn't mean the trip stops, it just moves indoors. Spring and autumn are when a shower is most likely to catch you mid-holiday, usually in short bursts rather than all-day downpours. When it happens, this is where to take the kids.
Start here if you only have time for one stop. Barcelona's science museum, run by Obra Social "la Caixa," spreads across nine underground floors and more than 30,000 m², but the moment that actually stops children in their tracks is the Flooded Forest: 1,000 m² of living Amazon rainforest under a glass dome, with caimans, boas and piranhas moving around at eye level. Watching rain hit the skylight while you're standing inside a rainforest is one of those small experiences that sticks with kids longer than most souvenirs.
The rest of the museum works the same way. Hands-on exhibits built around real scientific phenomena rather than static displays, so parents end up as curious as their children.
The Science Museum is open daily, 10am to 8pm. General admission is €8, and it's free for anyone under 16, a rare bargain for a museum this thorough.
📍 Carrer d'Isaac Newton, 26, Barcelona
📞 +34 932 126 050
Down at Port Vell, L'Aquàrium does something the original doesn't quite prepare you for. Its 80 metre underwater tunnel puts sharks, rays and moray eels directly overhead while you walk beneath them, at eye level with more than 11,000 animals from 450 species, making it one of the largest aquariums in Europe.
A recent renovation added the largest digital floor screen in Europe at the entrance and a new immersive room called Journey to the Depths, where visitors travel through different marine ecosystems aboard a virtual submarine before ever reaching the tanks. The Mediterranean gets its own dedicated space too, with a section on the Medes Islands and the Ebro Delta.
For families who want more than a walk-through, the aquarium runs guided tours explaining how different species feed and defend themselves, sensory activities for younger children, and, for anyone over 12 with a taste for something braver, an overnight "sleeping with sharks" experience right next to the shark tank.
The Aquàrium is open every day of the year, from 9.30am to 9pm (until 9.30pm on weekends and public holidays). Ticket prices are dynamic and change by date and season, so it's worth checking the official site before you go rather than relying on a fixed figure. Booking online also means skipping the queue, which on a rainy day, when half the city has the same idea, is worth doing.
📍 Moll d'Espanya del Port Vell, s/n, Barcelona
📞 932 21 74 74
Sometimes the best plan for a rainy day isn't a museum, it's just letting the kids run. Planeta Magic, in the Eixample district, has been doing exactly that since 2004: an indoor "Chiquipark" built for climbing, sliding and general chaos, with the kind of setup that lets parents actually sit down for a bit while their children burn off the energy that a morning stuck indoors tends to build up.
The park doubles as a spot for birthday parties and even hosts family lunches on weekend afternoons, "Todos juegan," where the whole family eats together with the play area open. Socks are required for anyone playing.
Hours shift by season, in the current summer schedule it's Monday to Thursday 11am to 2pm and 5 to 8.30pm, with slightly longer hours on Fridays and weekends, so it's worth checking ahead since a rainy day tends to fall outside peak summer. An hour of play runs around 8 to 9 euros, with an afternoon pass at 10 to 11 euros.
📍 Carrer Viladomat, 124, Barcelona
📞 934 53 54 00