Published September 2, 2026
Lisbon gets recommended for December on one argument: it's the mild one. That's true, and the national weather service numbers back it up more strongly than most people expect. What gets left out is the second half of the same data — December is also one of Lisbon's wettest months, and the amenity most families book this city for stops working. Both halves are below, with the source named each time.
IPMA, Portugal's national weather service, publishes climate normals for the 1991–2020 period at the Lisboa / Instituto Geofísico station. For December: a mean daily maximum of 15.4°C, a mean daily minimum of 9.4°C, and a monthly mean of 12.4°C. The line that matters most for packing is further down the same sheet — the average number of frost days in December is zero. Not low. Zero. You are packing a warm coat and a hat for the evenings, not thermals, and you can plan on being outdoors in the middle of the day rather than sprinting between buildings.
December brings 108.5 mm of rain across 10 days with at least 1 mm. The annual total at that station is 793.5 mm, so roughly an eighth of Lisbon's yearly rain falls in a twelfth of the year. Worth knowing before you shift your dates: November is wetter still at 133.9 mm, and October at 110.6 mm is marginally wetter than December too. Moving the trip a few weeks earlier does not buy you a drier city. What ten rain days out of thirty-one actually means in practice is that roughly two days in three are fine and you cannot know which, so the plan needs an indoor option every day rather than one rainy-day reserve for the week.
At the winter solstice the sun rises over Lisbon at about 07:51 and sets at about 17:18 — 9 hours 27 minutes of daylight. These are computed from the standard solar-position equations for the city centre rather than taken from a timetable, so treat them as accurate to a minute or two, not to the second. For context, that is the most daylight of any city on this site in December: Paris gets 8 hours 15 minutes on the same day. It is still dark by half past five. With children, the honest planning rule is one outdoor thing before lunch and one indoor thing after — and specifically, do not schedule the hill for four in the afternoon.
Lisbon's historic centre is built on seven hills and Alfama and Bairro Alto are steep and cobbled in any month. Wet cobbles and a stroller are a genuinely bad combination, and December is when you find that out. The flat alternatives are the waterfront districts — Belém and the modern Parque das Nações — and they're the ones I'd lean on harder in winter than I would in May. The funiculars and Tram 28 bridge some of the gap, but a queue for Tram 28 in the rain with a tired four-year-old is its own kind of afternoon.
This is the part only our own catalogue can tell you, and it's the reason this article exists. Of the five Lisbon hotels here, four have a pool — the best coverage of any city on this site. In December that four becomes two. Altis Grand Hotel has an indoor pool alongside its outdoor rooftop one, plus sauna and steam room. Corinthia Lisbon has both indoor and outdoor pools as part of one of the city's largest hotel spas. Those two still work. EPIC SANA Lisboa's pool is a rooftop one, and Tivoli Oriente's is described plainly as an outdoor pool for warm-weather relaxation. Jupiter Lisboa has none. If a pool is the reason you're booking, the December shortlist is two hotels long, not four.
The Oceanário de Lisboa is the strongest wet-weather card in this city, and its own site is unusually generous about the calendar: open daily from 10:00 to 20:00 with last entry at 19:00, no closing days at all through the year. Over the holidays the hours shift rather than stop — 10:00 to 19:00 on 24 and 31 December with last entry at 18:00, and 11:00 to 20:00 on 25 December and 1 January. That last detail is worth more than it looks: a major indoor attraction that is open on Christmas Day is not a common thing in Europe. Tivoli Oriente is a ten-minute walk from it, in the flat modern Parque das Nações district, which is about as low-friction as a December day with small children gets: no metro change, no hill, and somewhere warm at the end of it.
The Estufa Fria, the cold greenhouse in Parque Eduardo VII, is the obvious second indoor option, and EPIC SANA Lisboa is an eight-minute walk from that park. I'm not going to publish its hours or ticket price, because the sources I could reach disagree with each other — secondary sites variously give a winter schedule closed on Mondays and a daily one, and two different adult prices — and the official municipal page wouldn't load for me. So: it exists, it's close to one of our hotels, it's indoors, and you should check the current hours on estufafria.lisboa.pt before you build a morning around it.
If the pool is genuinely a deciding factor, it's Altis Grand at €285 or Corinthia at €195, and Corinthia has the additional December advantage of Sete Rios train and metro station directly adjacent — you can get into the historic centre without standing in the rain first. If the pool is a nice-to-have rather than the plan, drop it entirely and buy location instead: Tivoli Oriente at €140 next to the Oceanarium, or Jupiter Lisboa at €110, five minutes from Saldanha metro. In a month with ten rain days, the walk to the station is a bigger part of your trip than the swim.
Christmas lights, markets and seasonal events in Lisbon change dates and locations year to year, and I'm not going to state a schedule I can't confirm for the winter you're actually travelling in. Check the city tourism board close to your dates. Everything else above — the temperatures, the rainfall, the daylight, the pools — either comes from a national weather service, from the attraction's own site, or from our own hotel data, and doesn't move.
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