Alentejo Geography & Climate

The Alentejo covers around a third of mainland Portugal — everything south of the Tagus and north of the Algarve — and is defined by space.

The plains

Gently undulating country on ancient schist and granite, rising to low ranges and falling away again, with horizons that go on for tens of kilometres. There is very little relief and almost no forest in the conventional sense.

The montado

The characteristic landscape: widely spaced cork oak and holm oak over grassland grazed by sheep, cattle and black Iberian pigs, with cereal grown between the trees in rotation. It is an agro-silvo-pastoral system a thousand years old, and Portugal produces around half the world’s cork from it — stripped from the trunk by hand every nine years, leaving the tree alive and the bark regrowing, with the year of the last stripping painted on the trunk.

Alqueva

The dam on the Guadiana, completed in 2002, created the largest artificial lake in western Europe — some 250 square kilometres — drowning a village and transforming the region’s agriculture. The area around it was designated the world’s first Starlight tourism destination for the darkness of its skies.

Marble

The triangle between Estremoz, Borba and Vila Vicosa sits on one of the largest marble deposits in the world, worked continuously since Roman times. The quarries are enormous stepped pits, some cut hundreds of metres down, and the stone is common enough locally that villages pave their pavements and build their bus shelters in it.

The hills

The Serra de Sao Mamede in the north-east, greener and wetter, and the Serra de Grandola toward the coast.

The coast

Around 150 kilometres of Atlantic cliff and dune south of Sines, protected as a natural park, with cold water and strong surf.

The Alentejo has the hottest summers in Portugal and a sharp difference between the interior and the coast.

Summer

June to September inland is severe: daytime highs of 33 to 40°C are routine and readings above 45 have been recorded, with Amareleja holding the Portuguese record. Humidity is low, nights cool usefully, and life adjusts — shops close for the afternoon, work happens early and late, and the shade of a plane tree in a square is a functional piece of infrastructure.

The coast

Twenty degrees cooler on a bad day. Atlantic upwelling keeps the sea between 16 and 19°C even in August, and the sea breeze holds coastal air in the high twenties. Morning fog is common.

Winter

Mild but not warm: 5 to 15°C, with frost inland on clear nights and occasional cold snaps. The plains turn green and the streams run.

Rain

Between 500 and 650 millimetres a year, falling almost entirely between October and April, with long dry spells in between. Drought years are frequent and getting more so.

Fire

Summer wildfire risk is significant, and access to woodland and burning restrictions are legally enforced during the critical period.

Living with the heat

The architecture and the timetable are both adaptations. Streets are narrow and oriented for shade, squares have plane or orange trees clipped into a canopy, walls are thick and windows small, and the working day is split around a long afternoon pause. A visitor who fights that timetable has a much worse time than one who adopts it.

Sky

The Alqueva area has some of the darkest skies in Europe and is certified for astronomy.