It rains about 55 days a year in Barcelona, and when it does it tends to do it properly — heavy, sudden, and for a few hours rather than all day.
If one of those days lands on your trip, the good news is that it’s usually over by the afternoon. The better news is that this city has a genuinely strong indoor list, and most visitors don’t know what’s on it because the famous things here are all outdoors.
Here’s what we do when it rains, what each thing costs, and — the bit nobody else tells you — which of them are shut on a Monday.
Before anything else: check the day
Most Barcelona museums close on Mondays. A rainy Monday is the one combination that genuinely catches people out, so this table goes first:
| Open every day | Usually closed Mondays |
|---|---|
| CosmoCaixa | Museu Picasso |
| Barcelona Aquarium | Museu Blau |
| Casa Batlló | MNAC |
| Big Fun Museum | Most municipal museums |
| Poble Espanyol |
If it’s a wet Monday, go to CosmoCaixa. That’s the answer.
Where to stay in Barcelona — our three picks
Generator Barcelona – private family rooms at hostel prices, five minutes from Passeig de Gràcia and metro Diagonal (L3/L5). Rooms are small and the bar downstairs is lively, so ask for a higher floor.
H10 Cubik – on the edge of the Gothic Quarter, with the Atic rooftop terrace and pool. You can walk to the cathedral, the beach and the Born from the door, which saves you metro tickets all week.
The Cotton House Hotel, Autograph Collection – the old cotton guild building on Gran Via, a ten-minute walk from Casa Batlló and the Sagrada Família side of Eixample. Quiet, grown-up, and the rooftop is the reason to book it.
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The best rainy-day options, ranked by value
1. CosmoCaixa — €8, free under 16
The science museum in the hills, and the strongest rainy-day option in Barcelona for three reasons: it’s €8 for adults and free for everyone under 16, it’s open seven days a week, and it genuinely takes three to four hours, which is longer than almost anything else here.
Inside there’s a thousand square metres of living Amazon rainforest with caimans and piranhas, a six-metre woolly mammoth fossil, a planetarium and hands-on workshops split by age.
A family of four pays €16 for a half-day. Nothing else in this city comes close.
Full guide to CosmoCaixa here.
2. Museu Blau — €6, free under 16
The natural history museum out at the Fòrum. €6 for adults, free for under-16s, and free for everyone on Sundays from 3pm and all day on the first Sunday of the month.
Big, modern, rarely busy, and a good two hours. Closed Mondays.
Full guide to Museu Blau here.
3. Museu Picasso — €12, free under 18
In El Born, so you’re in the prettiest part of the old city where the narrow streets give you some shelter walking between things. Free for everyone under 18, and free for all on Sundays from 3pm.
Not the obvious choice with young children, but the early rooms — Picasso as a teenager in Barcelona, painting things that look nothing like what he became — land better with them than you’d expect.
Closed Mondays.
4. Barcelona Aquarium — €29 adult, and mind the age rule
Open every day, two to three hours, and the 80-metre shark tunnel is a proper rainy-day showstopper.
But it’s expensive and the child rule is unusual: “general admission” starts at age 11, so an eleven-year-old pays the full €29. A family of four with children of 7 and 12 pays €109.
Buy the family pack online — 2 adults + 2 children for €84 — because it doesn’t exist at the ticket desk.
Full guide to the aquarium here.
5. Casa Batlló — from €29, free under 12
If you were going to do one Gaudí interior anyway, a wet day is the right day for it. You’re inside for an hour or more, and children under 12 are free, which cuts a family of four roughly in half.
Open every day. Book a slot ahead — a rainy day is exactly when everyone else has the same idea.
Full guide to Casa Batlló here.
6. Poble Espanyol — €14.40 online, €9.00 child
A reproduction Spanish village on Montjuïc, with craft workshops and museums inside the buildings. It’s partly outdoors, so it’s a half-measure in heavy rain — but the workshops and interiors are covered, and it’s open until midnight Tuesday to Sunday, which makes it a good wet evening.
Under-4s free. Family pack €42.
Full guide to Poble Espanyol here.
7. Big Fun Museum — €22.50 online, and no child discount
On La Rambla, so it’s central and easy to get to when you’re soaked. Optical illusions, upside-down rooms, the kind of thing that produces a lot of photographs.
Be warned on price: there’s no child reduction above age 5, so a nine-year-old pays full adult rate and a family of four pays €100 at the door or €90 online. It’s the most expensive hour on this list.
Full guide to the Big Fun Museum here.
Rainy things that aren’t museums
Eat a long lunch
The most Barcelona answer there is, and I mean it seriously. A menú del dia — three courses, bread and a drink, typically €14–16 a head on a weekday — takes two hours if you let it, and two hours is usually how long the rain lasts.
This is genuinely what people here do. Nobody fights the weather; they go and sit down.
A rainy lunch on Bogatell beach with the sea going grey out of the window is one of the better versions of this city, and it’s the opposite of a consolation prize.
La Boqueria and the covered markets
La Boqueria off La Rambla is roofed, busy, loud and full of things to look at and eat. Santa Caterina in El Born is roofed too, less crowded and better for actually buying food.
Free to walk around, and an hour goes quickly.
The Gothic Quarter, properly
Counter-intuitive, but the medieval streets are narrow enough that the buildings almost meet overhead, and in light rain you stay surprisingly dry. It’s also the only time you’ll see those streets without crowds — the Gothic Quarter in the rain, with everyone else indoors, is one of the best free experiences in Barcelona.
Take an umbrella and walk it.
The Flotarium
If the rainy day has ruined your plans and you have someone to watch the children — a float tank is a strange and good way to spend fifty minutes, and it’s about as indoors as it’s possible to be.
Our actual rainy-day plan
With the boys: CosmoCaixa. It’s the easy answer — cheap, long, open every day, and they’ve never once been bored there.
If we’ve already done it that trip: Museu Blau, then a long lunch.
If it’s light rain: the Gothic Quarter and the Boqueria, then wherever we end up eating.
If it’s a Monday: CosmoCaixa, because most of the rest is shut.
What not to do in the rain
- Park Güell. Outdoors, uphill, slippery, and you’ve paid for a timed slot you can’t move.
- The Bunkers del Carmel. A steep climb to a view you won’t be able to see.
- Montjuïc cable car. Same problem — the view is the ticket.
- The beaches. Obviously. Though a stormy sea from the promenade is genuinely worth ten minutes.
- Booking anything non-refundable at short notice because the forecast says rain. Barcelona rain usually clears by afternoon, and you’ll be annoyed.
- Monestir de Pedralbes
One thing worth knowing
It almost never rains all day here. The pattern is a heavy few hours and then it stops, often with the best light of the week afterwards, because the air is washed clean and you can see right out past the port.
So plan the indoor thing for the morning, and keep the afternoon loose. There’s a reasonable chance you’ll end up on a terrace after all.
Frequently asked questions
What is there to do in Barcelona when it rains?
CosmoCaixa is the best option — €8 for adults, free for under-16s, open seven days a week and genuinely three to four hours. Museu Blau at €6 with under-16s free, Museu Picasso with under-18s free, the aquarium and Casa Batlló are the other strong indoor choices. A long menú del dia lunch at €14–16 a head is the most local answer of all.
Which Barcelona museums are open on Mondays?
CosmoCaixa, the Barcelona Aquarium, Casa Batlló, Poble Espanyol and the Big Fun Museum open every day. Museu Picasso, Museu Blau, MNAC and most municipal museums close on Mondays — which makes a rainy Monday the combination that catches visitors out.
What is the cheapest indoor thing to do in Barcelona?
CosmoCaixa, at €8 for adults with everyone under 16 free — a family of four pays €16 for a half day. Museu Blau is €6 with under-16s free, and is free for everyone on Sundays from 3pm and all day on the first Sunday of the month. Walking the Gothic Quarter and the covered markets costs nothing.
Does it rain a lot in Barcelona?
About 55 days a year, and it rarely rains all day. The usual pattern is a heavy few hours that clears, often leaving the clearest light of the week. Plan the indoor activity for the morning and keep the afternoon flexible.
What should you avoid doing in Barcelona in the rain?
Park Güell, the Bunkers del Carmel and the Montjuïc cable car — all outdoors, and in the case of the last two the view is the entire point. Avoid booking non-refundable tickets at short notice on a rainy forecast, since the weather usually clears by the afternoon.
Is the Gothic Quarter good in the rain?
Surprisingly, yes. The medieval streets are narrow enough that the buildings nearly meet overhead, so you stay fairly dry in light rain — and it is the only time you will see those streets without crowds, since everyone else goes indoors.
