title: "Mosquitoes in Portugal 2026: From Algarve to Lisbon | Mosticare" date: "2026-04-03" excerpt: "Tiger mosquitoes are expanding across Portugal, from the Algarve to Lisbon and beyond. Learn about the risk for expats, retirees, and tourists in Portugal." category: "markets" author: "Mosticare Editorial"

Mosquitoes in Portugal: From Algarve to Lisbon

Portugal's appeal as a retirement destination, digital nomad hub, and tourist hotspot is well established. The Algarve's golden beaches, Lisbon's vibrant culture, and Porto's riverside charm draw millions of visitors and a growing expat population each year. But Portugal is also experiencing a less welcome arrival: the Asian tiger mosquito (Aedes albopictus) is expanding across the country, moving northward from its initial foothold in the south.

First detected in the Algarve and Penafiel regions in 2017, followed by Alentejo in 2022 and Lisbon in 2023, the tiger mosquito is now present in an expanding number of Portuguese municipalities. In 2025, the Directorate-General of Health (DGS) confirmed the insect in four new municipalities: Condeixa-a-Nova, Covilha, Lagos, and Portimao.

For the hundreds of thousands of expats who have made Portugal home and the millions who visit each year, the mosquito situation is increasingly relevant.

The Expansion: South to North

Portugal's tiger mosquito colonization follows a clear geographic progression, spreading from the warmer southern regions northward.

The Algarve: Ground Zero

The Algarve was the first Portuguese region to confirm Aedes albopictus in 2017. The region's warm Mediterranean climate, with mild winters and hot summers, provides near-ideal conditions. The 2025 confirmation of tiger mosquitoes in Lagos and Portimao expands the known range within the Algarve.

The Algarve's tourism infrastructure -- resorts with pools, irrigated gardens, and golf courses -- creates abundant artificial breeding habitat for the container-breeding tiger mosquito.

Alentejo: The Inland Bridge

The detection in Alentejo in 2022 was significant because it demonstrated the species' ability to establish in Portugal's hot, dry interior. While the Alentejo has lower population density than the coast, agricultural irrigation and rural properties with water storage containers provide suitable breeding sites.

Lisbon: The Capital Reached

The arrival of Aedes albopictus in Lisbon in 2023 was a milestone. Researchers from the Instituto de Higiene e Medicina Tropical published a warning describing the arrival as an emerging public health threat, noting that Lisbon's dense urban environment, international connectivity, and growing suitability make it particularly vulnerable.

Lisbon's situation is compounded by the presence of Aedes aegypti -- the yellow fever mosquito -- on the Portuguese island of Madeira. While Aedes aegypti is not yet established on the mainland, the fact that Portugal hosts both major arboviral mosquito vectors (one on the mainland, one on the islands) places the country in a uniquely concerning position in the European context.

Central and Northern Portugal

The 2025 detections in Condeixa-a-Nova and Covilha indicate the tiger mosquito is pushing into central Portugal. Covilha, located in the Serra da Estrela foothills, suggests the species is not limited to the coastal lowlands.

Porto and northern Portugal have not yet confirmed established tiger mosquito populations, but the northward trajectory makes future establishment likely, particularly in the warmer Douro Valley and coastal areas.

Genetic Analysis

A first genetic analysis of Aedes albopictus in Portugal, published in Parasites & Vectors in 2024, traced the origins of Portuguese tiger mosquito populations. The study found genetic links to Spanish and broader European populations, consistent with the species spreading across the Iberian Peninsula via road transport.

Dengue Risk in Portugal

Portugal's dengue situation requires attention. Between January and October 2025, Portugal recorded 37 dengue cases, of which 35 were imported and 2 were locally transmitted on Madeira. While mainland local transmission has not been confirmed, the conditions are converging:

Established tiger mosquito populations in southern and central Portugal.
Hundreds of imported dengue cases from endemic regions annually.
Increasing climate suitability extending the transmission window.

The Institut Gulbenkian de Medicina (GIMM) has highlighted the challenges that both Aedes aegypti and Aedes albopictus present for Portuguese public health, noting that the country must prepare for the possibility of locally transmitted arboviral diseases.

The Expat and Retirement Angle

Portugal has become one of Europe's most popular retirement and relocation destinations. The Non-Habitual Resident (NHR) tax regime (now modified), the D7 passive income visa, and Portugal's affordable cost of living have attracted large communities from the UK, Germany, France, Scandinavia, and North America.

Algarve Retirees

The Algarve hosts the largest concentration of foreign retirees in Portugal. Many live in villa-style properties with gardens, pools, and terraces -- environments where tiger mosquitoes thrive. The lifestyle is fundamentally outdoor: al fresco dining, gardening, golfing, and walking are daily activities that increase mosquito exposure.

For retirees, many of whom are in age groups more vulnerable to severe arboviral disease, mosquito protection is a practical health concern, not just a comfort issue.

Lisbon and Silver Coast Expats

The growing expat community in Lisbon, Cascais, and the Silver Coast (Ericeira, Peniche, Caldas da Rainha) faces increasing tiger mosquito exposure as the species establishes in the greater Lisbon area. Apartment-dwellers in Lisbon are less affected than those in ground-floor or suburban properties with gardens, but the urban tiger mosquito adapts well to high-density environments.

Digital Nomads

Portugal's appeal to digital nomads -- who often work from cafes, co-working spaces, and outdoor terraces -- means extended exposure to daytime-biting tiger mosquitoes during the warm season.

Climate Drivers

Portugal is experiencing rising average temperatures, longer summers, less severe winters, and irregular rainfall -- conditions that create an increasingly favourable environment for mosquito survival and reproduction.

Key climate factors:

Winter warming: Milder winters improve overwintering survival for tiger mosquitoes, enabling population persistence in areas that were previously too cold.
Extended summers: The warm season in southern Portugal now stretches from April through October, providing a longer reproductive window.
Drought and irrigation: While overall rainfall may decrease, the reliance on irrigation in gardens, agriculture, and golf courses ensures artificial water sources remain available for breeding.

Practical Advice

For Residents and Expats

Eliminate standing water in gardens, terraces, and pool areas. Check rain barrels, plant saucers, and drainage systems weekly.
Install mosquito screens on windows and doors -- many Portuguese properties lack them as standard.
Use DEET or icaridin-based repellent during outdoor activities, particularly from late afternoon through the evening.
Report suspected tiger mosquitoes to local health authorities or through the Mosquito Alert app.

For Tourists

Pack repellent, particularly for Algarve and Lisbon visits between May and October.
Choose accommodation with air conditioning or screened windows.
Be aware that the tiger mosquito bites during the day, unlike most native Portuguese mosquito species.
If visiting Madeira, note the additional risk from Aedes aegypti and the occurrence of local dengue cases.

For Property Owners

Rental property and hospitality operators should invest in mosquito prevention as part of guest experience management.
Professional larviciding of ornamental water features, pools (when not in use), and drainage systems.
Providing mosquito protection amenities (repellent, plug-in devices, screens) differentiates properties in the competitive Portuguese rental market.