リスボン旅行のベストシーズン：気候・混雑・費用

6月12日の夜になると、リスボンの大通りは“地区の舞台”に変わります。仮装したグループがマルケス・デ・ポンバルからロシオへ向けてアヴェニーダ・ダ・リベルダーデを練り歩き、アルファマ、バイロ・アルトなどの旧市街ではサント・アントニオの夜の準備が進みます。リスボンをいちばん祝祭的に味わうなら、6月に勝る月はそうありません。とはいえ、ほとんどの旅行者にとってのベストタイミングは4〜6月、または9月〜10月上旬。気温が心地よく、歩きやすく、真夏より脚にも優しい季節です。

最適な月は、暑さ・雨・混雑への耐性で変わります。リスボンは坂の街で、見晴らしのいい展望地、川風、クルーズ船が集中する時間帯など、条件次第で体感が大きく変わります。ウォーターフロントでは快適でも、グラサ（Graça）への上り坂では別世界、ということも。あなたが本当にしたい旅に合わせて、月を選びましょう。

The short answer: best months for most trips

Choose April, May, early June, September or early October for the best balance of weather and sightseeing. These months suit first-timers planning long days around Alfama, Baixa, Chiado, Belém and viewpoints, especially with an on-foot plan like our 3 days in Lisbon itinerary.

Choose June for festivals. The Festas de Lisboa fill the month, and Santo António is not just a generic summer saint here: Visit Portugal says he was born near the Cathedral in Alfama around 1193. Today the parties still concentrate in old neighbourhoods including Alfama, Mouraria, Graça, Bica and Bairro Alto.

Choose July or August for dry weather and beach rhythm, not for monument-hopping at noon. August is Lisbon’s hottest month in the IPMA 1991–2020 normal, and the same normal sheet records an extreme maximum of 43.3°C on 4 August 2018.

Choose winter for museums, restaurants and a calmer cultural trip, as long as you can accept rain. January and February are mild by northern European standards, but wet days are part of the deal.

Lisbon month by month: weather, crowds and costs

Climate figures below come from the IPMA 1991–2020 Lisbon / Instituto Geofísico normal. Treat them as planning averages, not a replacement for a 7–10 day forecast. Hotel prices vary by week, event and availability; for price-sensitive trips, compare live booking sites and monthly ADR/RevPAR data from TravelBI.

Month	Weather	Crowds and costs	Best for
January	最高15.1°C、最低8.6°C；雨量103.8 mm	屋外での行動に向く日が少なめ。料金は要確認	博物館、カフェ、雨の合間の展望台
February	最高16.4°C、最低9.1°C；雨量77.8 mm	大きなイベントがない時期は落ち着く	食べ歩きの週末、短い散策、ギャラリー巡り
March	最高18.9°C、最低11.0°C；雨量68.7 mm	春のイベントが始まる	MONSTRA、ModaLisboa、テラスで過ごしやすい季節
April	最高20.4°C、最低12.3°C；雨量71.8 mm	クルーズのピークで混みやすい	初めての街歩き、庭園、IndieLisboa
May	最高23.1°C、最低14.4°C；雨量57.8 mm	人気はあるが真夏ほど暑くない	徒歩観光、ベレン、カスカイス日帰り、ブックフェアの季節
June	最高26.1°C、最低16.8°C；雨量14.1 mm	祭りの時期で需要が高い	Festas de Lisboa、遅い夕食、ストリートパーティー
July	最高28.2°C、最低18.2°C；雨量2.6 mm	夏の旅行需要が高い	ビーチ、朝の観光、Jazz em Agosto の時期
August	最高28.8°C、最低18.8°C；雨量5.4 mm	暑く乾燥し、ビーチ寄りの過ごし方に向く	カスカイス線、日陰の午前、ゆったりした夕方
September	最高26.6°C、最低17.6°C；雨量38.6 mm	にぎわうがバランスがよい	ビーチ＋街歩き、MOTELX、温かな夜
October	最高22.8°C、最低15.3°C；雨量110.6 mm	クルーズのピークやイベントが重なることも	Doclisboa、ModaLisboa、レストラン巡り
November	最高18.1°C、最低11.8°C；雨量133.9 mm	最も雨が多い月。会議需要の影響も	博物館、食、柔軟な旅程
December	最高15.4°C、最低9.4°C；雨量108.5 mm	休暇シーズンで週によって差がある	クリスマスマーケット、イルミネーション、屋内中心の旅

Spring: long walks before the heat

March to May is Lisbon’s most comfortable walking stretch. March still has rain, but the average high rises to 18.9°C, which is enough for relaxed neighbourhood routes between showers. It is a good season for Alfama stairs, Graça viewpoints and the castle area before the climbs feel like a summer workout.

April is warmer, greener and busier. In 2025 it was Lisbon’s busiest month for cruise calls, with 55 calls and 98,686 cruise passengers, so Baixa, Alfama streets near the waterfront and major tram stops can feel crowded on ship-heavy days. That is a reason to plan carefully, not to skip April.

May may be the easiest all-rounder. The average high reaches 23.1°C, rainfall drops compared with April, and the Cascais coast starts to make sense for half-days. Cascais municipality’s cited 2026 bathing season ran from 1 May to 30 September, but lifeguard dates, beach rules and water-quality notices change, so check current information before swimming.

Spring also has strong cultural pull. MONSTRA is a March animation festival; ModaLisboa lists March and October fashion-week editions; IndieLisboa often spans late April and early May. Always confirm annual dates, venues and ticket rules before booking around an event.

Summer: festas, beaches and slow afternoons

June is the bridge between sightseeing season and summer living. The average high is 26.1°C, and IPMA records only 14.1 mm of rain in the normal, so outdoor dinners and street plans become easier. It is also when Lisbon’s neighbourhood identity spills into the streets.

The Marchas Populares are a modern reinvention of older neighbourhood festivities. Lisbon City Council traces the official competition to 1932, when José Leitão de Barros promoted the idea through the press and the city adopted it into the official programme. Today, each bairro prepares costumes, choreography and original music for months before parading on Santo António night.

July and August are very dry by Lisbon standards. July averages only 2.6 mm of precipitation and 0.6 rainy days; August averages 5.4 mm and 1.1 rainy days. The trade-off is heat: August averages 10.2 days at or above 30°C and 6.8 tropical nights, when the minimum temperature stays at or above 20°C.

This is when the hills decide your itinerary. Visit Lisboa describes Graça as sitting at the top of one of Lisbon’s famous hills, and the São Jorge viewpoint requires a steep climb up toward the castle. In summer, walk early, save indoor or riverside plans for hotter hours, and let evenings do more of the work.

Beach days are the practical escape. CP’s Lisbon–Cascais line shows scheduled journeys from Cais do Sodré to Cascais taking 40 minutes, and Visit Cascais gives the same timing. Farther west, Guincho is not a gentle floating beach: Cascais municipality describes strong swell and strong winds, which is why it is linked with windsurfing and kitesurfing.

Autumn: warm evenings, film nights and rain risk

September is one of Lisbon’s best compromise months. The average high is still 26.6°C, the average low is 17.6°C, and rainfall remains far below October. If you want city walks plus Cascais or Costa da Caparica beach time, September often works better than July because you avoid the harshest heat.

It is also the month for MOTELX, Lisbon’s international horror film festival, which held its 20th edition in September 2026 at Cinema São Jorge and Cinemateca Portuguesa. Dates shift, but the pattern gives September a strong after-dark cultural reason to visit.

October is more complicated, but often rewarding. The average high is still 22.8°C, while rainfall jumps to 110.6 mm and 8.7 rainy days. Doclisboa commonly falls in October, ModaLisboa has an October edition, and restaurants feel especially appealing when the weather turns.

Cruise crowds are the other October variable. Lisbon Cruise Port recorded 369 cruise calls and 763,752 passengers in 2024, then 335 calls and 705,437 passengers in 2025. October was the biggest passenger month in 2024 and one of the top months in 2025, so check the current port calendar if daytime crowding around the waterfront, Baixa or Alfama matters to you.

For a neighbourhood-based plan that reduces backtracking in wet weather, use our Lisbon travel guide to neighborhoods, sights and transit.

Winter: museums, food and flexible plans

November is the wettest month in the IPMA normal, with 133.9 mm of precipitation and 9.9 days with at least 1 mm of rain. It can still be mild, with an average high of 18.1°C, but it is not the month for a rigid outdoor-only itinerary.

Check the conference calendar before choosing dates. Web Summit is scheduled for Lisbon in November 2026, and large events around Parque das Nações can affect accommodation prices, restaurant availability and traffic. If your dates overlap, book earlier and compare neighbourhoods.

December and January are cool, damp and atmospheric in the practical sense: good for lights, cafés and indoor breaks, but not guaranteed dry. Visit Portugal describes recent Christmas-market attractions including Wonderland Lisboa in Parque Eduardo VII, with a Ferris wheel and ecological ice rink, and Rossio Christmas Market in the lower city. Dates change annually.

February is better for travellers who like slow mornings and indoor culture. The average high rises to 16.4°C, and rainfall is lower than January. For rainy-day movement, read our guide to using public transport in Lisbon before you arrive.

Festivals and events to plan around

Lisbon’s calendar is strong, but annual dates, venues, ticket prices and free/paid rules change. Confirm with official event sites before booking non-refundable rooms.

• MONSTRA: animation festival, usually in March, with screenings, retrospectives and exhibitions.
• ModaLisboa: Lisbon Fashion Week, with March and October editions listed in the cited calendar.
• IndieLisboa: independent film festival, often spanning late April and early May.
• Lisbon Book Fair: held in Parque Eduardo VII in the cited edition, with hundreds of pavilions and many scheduled events.
• Festas de Lisboa: June is the main month, with the Santo António high point on the evening of 12 June.
• Jazz em Agosto: Gulbenkian jazz festival, around late July and early August in the cited edition.
• MOTELX: horror film festival, typically in September.
• Doclisboa: documentary film festival, typically in October.
• Web Summit: not a festival, but important for November accommodation and traffic.
• Christmas markets: late November, December and sometimes early January in recent editions.

Months to avoid for your travel style

Avoid August if your dream Lisbon trip is full-day hill walking, tram queues and exposed viewpoints. It is not a bad month; it is simply better for beach trains, shaded mornings and slower evenings. If you do visit then, save our Alfama walking tour for the coolest part of the day.

Avoid November if rain would spoil the trip. It is the wettest month in the climate normal, and major conferences can make accommodation planning harder when dates overlap.

Be cautious with April and October if you dislike cruise-day crowding. Both can be excellent for weather or culture, but recent Lisbon cruise data shows they can be especially busy. Check the current port calendar, because ship deployment changes by year.

Avoid assuming December and January are empty. They are calmer than summer for many sights, but holidays, markets, rain and shorter daylight still shape the trip. A flexible plan and a few indoor backups matter more than chasing a perfect forecast.