When's the best time to visit Lisbon in 2026?

For a first trip, book late September or October. Highs in Lisbon tend to sit between 22 and 26°C, and on 16 October 2026 the city read 24.5°C under clear skies at 6pm. The Atlantic off Carcavelos still holds around 19 to 20°C, about as warm as it gets here, which makes an afternoon swim after Belém a real option, not a dare. Mind you, rain starts creeping back in the last week of October. By November Lisbon averages roughly 100 mm of rain, and the polished limestone calçada on Rua Augusta turns slick as soap underfoot. From late October the chestnut sellers wheel their smoking carts onto Rossio, and a paper cone of castanhas assadas, charred and sweet, costs around €3.

May is a strong second choice. Highs reach 21 to 23°C, and near the end of the month the jacarandas on Largo do Carmo and Avenida Dom Carlos I start dropping purple petals across the pavement. June is different. The Festas de Lisboa run all month, and on the night of 12 June Alfama and Mouraria fill shoulder to shoulder for Santo António, with sardine smoke drifting up every stairway and pimba music thumping until 4am. It is the best street party in Portugal, and for that reason it makes a poor week for a first visit: room rates around Alfama tend to double, and nobody sleeps within earshot of Largo de São Miguel.

Skip July and August if this is your first time. Heat waves push Lisbon past 35°C on several days most summers, and the climb from Baixa up to the Castle of Saint George is hard going on hot cobbles at 3pm. Tram 28 queues at Martim Moniz can run 45 minutes or longer, and Belém Tower can keep you standing in full sun for over an hour. If August is your only window, book a skip-the-line Belém slot for 10am and do Pena Palace in Sintra early, while the hill fog still keeps its terraces cool.

Winter is cheaper and quieter, but it comes with a real catch. From December to February, afternoons hover in the mid-teens Celsius, the low light turns the Tagus gold by 4pm, and rooms in Chiado can run about half the summer rate. The rain, though, arrives in heavy Atlantic bursts, and many of Lisbon's older apartments have no central heating, making a cold, damp room in January entirely possible. Pack a rain shell and rubber-soled shoes for the slopes of Bairro Alto. One more trap: Web Summit in early November fills hotels around Parque das Nações and pushes prices up across the city that week.