Best time to visit Lisbon, month by month: weather, holidays, closures and Web Summit week

💡 The Short Version: For weather, May and September pair highs of 23 to 27°C with four to six rainy days; June to August run at 26 to 29°C with almost no rain (14 mm in June, 3 mm in July), and October to January are the wet months, with 104 to 134 mm. 13 June is Lisbon’s own holiday, when the Jerónimos Monastery and Belém Tower close; see Santos Populares. Web Summit (9 to 12 November 2026) put hotel rates up 26.7% in 2025. The São Jorge Castle closes at 18:00 from 1 November and stays open to 21:00 from 1 March. Or book a tour: the Sintra small-group tour with ticketsad (from £58.08, GetYourGuide, 1 October 2026) takes the heat and the planning out of a summer day.

Lisbon month by month

Weather is IPMA’s 1991 to 2020 average for the Lisbon Geophysical Institute station, 77 m above sea level (ipma.pt, 1 October 2026). Highs and lows are in °C; rain is the month’s total and the days with at least 1 mm. Events and closures are from each organiser’s or operator’s own page, read on 1 October 2026.

Sunset over Lisbon and the Tagus from the Miradouro da Graça. Photo: TheDumpy, Wikimedia Commons, CC BY-SA 4.0.

The weather in numbers

• Heat: July and August average highs of 28.2 and 28.8°C. August has 27.4 days at 25°C or more and 10.2 days at 30°C or more, and 6.8 nights that stay at 20°C or more. The station’s record is 43.3°C, on 4 August 2018.
• Rain: November averages 133.9 mm, the most of any month, and July 2.6 mm. October, November, December and January all have 9 or 10 rainy days.
• Cold: the coldest month, January, averages a low of 8.6°C, and the series records no frost in any month.
• The mild months: May has a 23.1°C high and 5.8 rainy days; September has 26.6°C and 3.8. October is the month the rain returns: 110.6 mm.

Praça do Comércio on a clear afternoon, with the São Jorge Castle hill behind the arcades. Photo: Berthold Werner, Wikimedia Commons, CC BY-SA 4.0.

Web Summit week

Web Summit 2026 is 9 to 12 November at the MEO Arena in Parque das Nações (websummit.com, 1 October 2026). Hotel rates move with it. A study by NOVA IMS, using Host Intelligence data from 155 of the 548 hotels in the Lisbon region, compared the week of Web Summit 2025 with the week before (Dinheiro Vivo, 26 November 2025):

These are averages across the region, not the price of any one hotel. Web Summit has not published dates for 2027. Check its dates before you book a November stay; where to stay in Lisbon compares the areas.

Public holidays and what they close

Portugal’s national holidays are 1 January, Good Friday, Easter Sunday, 25 April, 1 May, Corpus Christi, 10 June, 15 August, 5 October, 1 November, and 1, 8 and 25 December. Lisbon adds 13 June, the feast of St Anthony (lisboncruiseport.pt, 1 October 2026). The rest of 2026 and 2027 fall like this:

Carnival, 24 June (St John) and 29 June (St Peter) are not public holidays in Lisbon.

What the sights do on these days, from each operator’s own page:

Sources: mosteirojeronimos.torrebelem.gov.pt, castelodesaojorge.pt, parquesdesintra.pt and oceanario.pt, 1 October 2026. The Gulbenkian Museum and MAAT close on Tuesdays. The what to book before you go page keeps the full closing-day list, and Sintra can also close for wind or fire risk.

Which month for what

• Walking the hills: May and late September, when the highs are 23 to 27°C and the rain is light. The Glória, Bica and Lavra funiculars and the Santa Justa Lift are shut, so the climbs are on foot; see Tram 28 and the funiculars.
• The beach and a rooftop pool: June to September, when the highs are 26 to 29°C. Lisbon hotels with a rooftop pool gives each pool’s months, and Cascais is 38 to 40 minutes by train.
• The June festival: the Marchas Populares parade, the street parties and the grilled sardines, with 13 June a closed day for Belém. The Santos Populares guide has the dates.
• Fewer queues: the wet months, November to January, apart from Web Summit week and the Christmas weeks. Bring a coat and plan indoor stops: the Oceanário is open every day.
• A day out: Sintra and the other day trips from Lisbon are best on a dry day; Pena Palace is a timed slot whatever the weather.

Praia de Carcavelos at dusk, one of the beaches on the Cascais Line. Photo: Sonse, Wikimedia Commons, CC BY 2.0.

August

The main sights stay open, and so does the Oceanário. Some small local businesses, tascas and pastry shops close for days or weeks, often with a paper sign on the door, so confirm a table before you cross the city for it, according to the food-tour operator Taste of Lisboa (2 August 2026). The Lisbon food tours run through August, and each entry in where to eat in Lisbon gives its closed days.

For a plan once you have picked the dates, see 3 days in Lisbon and Lisbon in one day; for a cruise day, Lisbon cruise port to the city centre; for the way in by air, Lisbon airport to the city centre; and for the bookings that sell out in any month, what to book before you go in Lisbon.