The short answer
Late April to early June and late September to late October are the best weeks: daytime highs of 20-26C, low rainfall, long light and terraces that work without shade or heaters. They are also the busiest and most expensive, with central doubles at €180-260. If you want the same weather with fewer people, aim for the first half of March or the first two weeks of November, accepting a real chance of rain. January and February are the cheapest months in the city and the ones where a €200 room becomes a €110 room.
What Lisbon does not have is a bad season in the way northern Europe does. The average January high is about 15C and snow is essentially unknown; the coldest problem is that older buildings heat badly and the wind off the Tagus bites on the miradouros. Summer heat is real but moderated by the Atlantic, and August evenings are usually pleasant by 8pm. The decision is less about survivability than about crowds, prices and how much you mind queuing for the 28E tram.
Spring: March to May
March is a gamble worth taking. Highs climb from 17C to 20C, the jacarandas are still bare but the parks are green after winter rain, and hotel rates in Chiado and Príncipe Real sit at €120-170. Rain comes in bands rather than all day, so pack a light shell rather than an umbrella you will fight with on windy viewpoints. Easter, whenever it falls, spikes prices for about ten days and fills Sintra and Cascais with Portuguese and Spanish families, which is worth planning around if a day trip is on your list.
By late April Lisbon is at its best. Temperatures settle at 21-24C, the light turns clear and the jacaranda trees around Praça do Príncipe Real and Avenida Dom Carlos I bloom purple through late May and into June. Every rooftop bar reopens, the Cascais and Costa da Caparica beaches are usable if the Atlantic water at around 17C does not deter you, and there is enough evening warmth to eat outside. Book accommodation eight to ten weeks ahead; the good small hotels in Alfama and Príncipe Real sell out first.
Summer: June to August
June is the month with the festival. The Festas de Lisboa run all month, peaking on the night of 12 June for Santo António, when Alfama, Mouraria, Graça and Bica fill with grilled sardines, plastic cups of beer, paper decorations and street parties that run until dawn. Rooms in those neighbourhoods are both expensive and unusable for sleeping; the Avenida da Liberdade marchas populares parade on the 12th is worth seeing once. Prices peak, and if you are not there for the party, avoid the second week of June entirely.
July and August bring highs of 28-31C, occasional 38C spikes when the wind comes off the interior, and the strongest crowds. This is when the hills punish you: plan museums and indoor lunches from 1pm to 4pm and save the miradouros for evening. The upside is the nortada breeze, cheap trains to Carcavelos and Cascais on the Cais do Sodré line, and the ferry across to Cacilhas for a river breeze. Restaurants in central Lisbon rarely close for holidays, but small family tascas often shut for two weeks in August.
Autumn: September to November
September is a straight upgrade on August. The heat drops to 26-28C, sea temperatures peak around 19-20C, and the crowds thin after the first week. Late September and the whole of October are the second peak: warm days, cool nights, and the year's best light for photography on the Tagus. Central hotels return to €170-240. Rain arrives properly in the second half of October, usually as short heavy bursts rather than grey drizzle, and the cobbled slopes get genuinely slippery, so shoes with grip matter more than in summer.
November splits in two. The first half is mild, quiet and cheap, with highs near 18C and rooms at €100-150. Then Web Summit lands, usually for four days in mid-November, and roughly 70,000 delegates fill every hotel from Parque das Nações to Cais do Sodré. Rates double or triple, availability collapses, and the metro red line towards the venue is packed at 8am and 7pm. Check the dates before you book; a trip shifted by one week can save you €400 on four nights.
Winter: December to February
Winter is Lisbon's honest bargain. Highs of 15-16C, roughly 100mm of rain a month, and long stretches of blue sky between fronts. The city keeps working: fado houses in Alfama are full of locals rather than coach groups, restaurants take walk-ins, and the queue at the Elevador de Santa Justa disappears. Rooms that cost €220 in May go for €110-140, and the boutique hotels in Chiado and Príncipe Real that are impossible in autumn become bookable a fortnight out. Bring a warm layer for the miradouros; the wind off the river is sharper than the numbers suggest.
Two exceptions. Christmas week and New Year push prices back up, with Praça do Comércio hosting the city's fireworks at midnight on 31 December and hotel minimum stays of three or four nights. And in January and February the daylight ends around 6pm, which compresses sightseeing. Balance that with the fact that indoor Lisbon is excellent in winter: the Gulbenkian, the Museu Nacional de Arte Antiga in Santos, the tile museum at Madre de Deus and long lunches in Campo de Ourique all improve when it rains.
How the calendar hits your room rate
Roughly, a good central double follows this curve: €100-140 in January and February, €120-170 in March, €180-260 from mid-April through June, €170-230 in July and August, €190-260 from mid-September to mid-October, €110-160 in the first half of November, and chaos during Web Summit. Add the €4 per person per night tourist tax to all of them. Weekends run 15-25 percent above midweek in every month, and Sunday to Wednesday arrivals consistently beat Thursday to Saturday for the same hotel.
The practical planning rule: pick the month first, then the neighbourhood, then the hotel. In peak season the good small properties in Alfama, Chiado and Príncipe Real sell out two to three months ahead, and what remains is overpriced Baixa stock at the same rate. In low season you can flip that, arrive with a two-night booking and extend at the desk. If your dates are fixed and fall in peak, book accommodation before flights; flights to Lisbon are plentiful, and central beds are not.
Good to know
Questions, answered
What is the cheapest month to visit Lisbon?
February, followed closely by January and the first half of November. Central four-star doubles that cost €220 in May routinely sell at €110-140, and restaurants take walk-in bookings. Expect highs around 15-16C, a good chance of rain, and daylight ending by 6.30pm, but also almost no queues at the major sights.
Is Lisbon too hot in August?
It is hot but manageable. Average highs are 28-30C with occasional 36-38C days when the wind swings inland, and the Atlantic breeze usually cools evenings from about 8pm. The real problem is the combination of heat and hills. Plan indoor museums from 1pm to 4pm, and use the trains to Carcavelos or the ferry to Cacilhas for air.
When is Santo António in Lisbon?
The Festas de Lisboa run through June, with the main night on 12 June and the public holiday on 13 June. The marchas populares parade down Avenida da Liberdade on the night of the 12th, and Alfama, Graça, Mouraria and Bica hold street parties with grilled sardines until dawn. Book months ahead and do not expect to sleep in those neighbourhoods.
Does it rain a lot in Lisbon?
Rain is concentrated between November and March, at roughly 100-125mm a month, and it usually arrives as heavy bursts with clear spells between rather than all-day grey. June to September is close to dry, with July and August often under 10mm. The bigger winter nuisance is wind on the exposed miradouros and slick cobbles on the steep streets.
When should I avoid Lisbon?
Web Summit week in mid-November, when 70,000 delegates take every room and rates double or triple, and the week around 12-13 June if you are not there for Santo António. Easter week and the days either side of New Year also spike prices with minimum-stay requirements. Check all three before you fix your dates.
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