Algarve Geography, Climate & Nature

The Algarve covers 4,997 square kilometres as mainland Portugal's southernmost NUTS II region, incorporating 16 municipalities with 467,495 permanent residents. Geographically the region splits into two halves: Barlavento, the rockier, more dramatic western coast around Lagos and Sagres, and Sotavento, the flatter, calmer eastern coast toward the Spanish border at Tavira.

The Ria Formosa lagoon, a system of barrier islands connected to the Atlantic through six inlets, dominates the central-eastern coastline around Faro; part of it forms a 170-square-kilometre protected natural area. Inland, the Serra de Monchique rises to Fóia, the Algarve's highest point at 900 metres, its slopes covered in chestnut and eucalyptus. The wild western coast, from Sagres north along the Atlantic, lies within the Southwest Alentejo and Vicentine Coast Natural Park, one of the last stretches of undeveloped coastline in western Europe. The region's most dramatic geological feature offshore is Cape St. Vincent, near Sagres, a sheer clifftop marking the southwesternmost point of continental Europe.

The Algarve has a Mediterranean climate, among the sunniest in Europe with roughly 300 sunny days a year, moderated by its Atlantic coastline. Summers, from June to September, are warm to hot and dry, with July and August the hottest months; the sea keeps coastal temperatures somewhat more comfortable than inland areas like the Serra de Monchique foothills, and clear skies mean cooler nights even at the height of summer.

Winters, from November to March, are mild and wetter, rarely cold by northern European standards, making the region a popular winter-sun destination for golf and sightseeing. Spring and autumn offer the most balanced conditions, warm and dry with fewer crowds. The region's dry summer conditions bring an increased wildfire risk from April to October, when hot, dry weather and vegetation combine; wildfires can start anywhere in Portugal and travellers should follow any local evacuation guidance.

The Algarve's two great protected landscapes sit at opposite ends of the region. The Ria Formosa, a lagoon system of barrier islands connected to the Atlantic by six inlets around Faro, is a Ramsar-listed wetland and an internationally important bird area, recognised as one of Portugal's seven natural wonders in a 2010 public vote; part of the system is protected as a 170-square-kilometre natural area. At the region's western edge, the Southwest Alentejo and Vicentine Coast Natural Park protects one of the last stretches of wild, undeveloped coastline in western Europe, with over 12 endemic plant species and among the highest biodiversity levels in Portugal.

Inland, the Serra de Monchique's slopes, covered in chestnut and eucalyptus forest, rise to Fóia at 900 metres, the region's highest point, providing a cooler, greener habitat distinct from the coastal plains. The region's agricultural land, historically given over to olives, figs, carob and almonds, has more recently seen expansion of intensive greenhouse farming near the Vicentine coast, a documented pressure on local water resources and native flora.

The Ria Formosa lagoon is the Algarve's premier wildlife destination, a vital stopover for migratory birds during the spring and autumn migration seasons and a BirdLife International Important Bird Area covering more than 43,000 hectares across its lagoon and oceanic zones combined. The wetland also supports commercial shellfish farming, including grooved carpet shell clams, reflecting the ecological richness of its tidal flats.

Along the wild Vicentine coast, cliff-nesting seabirds find some of their last undisturbed habitat in western Europe, part of what makes the Southwest Alentejo and Vicentine Coast Natural Park such a significant conservation area. Inland, the Serra de Monchique's forested slopes support more typical Iberian woodland wildlife, distinct from the coastal and wetland species that draw most visitors' attention.