Between the 11th and the 21st of September 2026, depending on the stage of schooling, children go back to class and the country belongs to a different crowd.
With the beaches empty, prices come down from the high season and restaurants have window tables again. For parents who spent July and August at the beck and call of the summer holidays, September is the reward: the month of getaways for two.
And it is not only about the quiet. September also has a secret few people know, and it comes down to physics: the sea off Portugal is warmer than it is in June, because the Atlantic spends the whole summer warming up and gives that heat back at the end. Add the Douro grape harvest, the Pousadas de Portugal and their centuries of history, all to yourselves midweek, and Madeira without the crowds, and the month plans itself.
This guide is organised by the kind of trip you want rather than by hotel: wine and landscape, a night inside history, or simply the beach that August kept from you. Take your pick.
September for two at a glance
Why now: school starts between the 11th and the 21st of September and destinations empty out.
Sea: warmer than in June, at 21 to 25 °C in Algarve.
Grape harvest: September is the season in the Douro, with wine estates that let visitors join in.
Plans: the grape harvest, historic Pousadas, beaches without the crowds, midweek stays at mid-season prices.
Why is September the best month to travel as a couple?
First, the thermal maths: in Algarve, the sea in September sits between 21 and 23 °C on the western Barlavento coast and between 22 and 25 °C on the eastern Sotavento, compared with 18 to 21 °C in June. That makes the September sea 2 to 4 degrees warmer than at the start of summer. Even around Lisbon and the Arrábida, September and October are often the best months for swimming. Swap August for September and you lose none of the summer: you get the best of it.
Then there is the social arithmetic. Once school is back, between the 11th and the 21st of September, the families disappear and destinations belong to anyone free to travel out of season. Hotels shift into mid-season, the roads and beaches have room to breathe, and a Tuesday in the Douro or in Alvor feels like another country. It is the perfect reversal: when everyone else goes home, parents head off.
Grape harvest for two in the Douro
The right base is at the gateway to the river: the Pestana Palácio do Freixo, an 18th-century baroque palace designed by Nicolau Nasoni and a National Monument, on the bank of the Douro about 3 kilometers from Porto’s historic centre. After a day in the vineyards, the panoramic pool over the river, or the heated indoor one when the night turns cool, takes care of the rest.
Sleeping among the centuries: Pousadas for two
If your idea of a getaway is waking up inside history, the Pousadas de Portugal are where to look: there are 35 of them, set in palaces, monasteries and castles from north to south. Our favourites are gathered in one guide, Pousadas de Portugal: the guide to choosing yours, from castles to convents. For September for two, one stands out.
The Pousada Mosteiro Amares, between Braga and the Serra do Gerês, occupies a 12th-century Cistercian monastery restored by Eduardo Souto de Moura, winner of the 2011 Pritzker Prize. The restaurant is set in the monastery’s old kitchen and the marble pool looks out over the hills. Come midweek, when the September quiet settles over it, and it is one of the most intimate stays you can have in Portugal.
The beach is yours now: where is the sea warmest?
For classic sun and sea, September is hard to beat. In Algarve’s Sotavento, between Tavira and the Ria Formosa, the water reaches 25 °C, its highest of the year. On the islands the season runs even longer: in Madeira the September sea sits between 22 and 24 °C, and on Porto Santo early autumn brings water at 23 to 25 °C along the longest golden-sand beach in the archipelago. Madeira in September is the off-season at its best: trails and viewpoints without queues, Funchal’s café terraces to yourselves, and the sea just right.
If you would rather stay on the mainland, head for the Alentejo coast, where September is summer at its calmest. We have written two pieces on this coast after the crowds have gone: The Comporta you can’t see from the road: Pestana’s new retreat among dunes and rice fields and Comporta, Tróia and Porto Covo: the Alentejo by the sea, away from the crowds.
Midweek, at mid-season prices
The last point in September’s favour is the shape of the week. With no school holidays calling the shots, a couple can travel from Tuesday to Thursday, when hotels have more availability and better deals, and keep the weekend free. In Lisbon, that logic gets you a palace: the Pestana Palace, set in the 1890 Palácio Vale Flor, a National Monument with French-style gardens, is the kind of house people fight over in August and savour in September. And if your date for two falls later in the year, our piece on Valentine’s Day on a Saturday explains how to make the most of February.
Frequently asked questions about September getaways for two
Because it brings together three rare things: destinations empty as schools go back, prices come down from the high season, and the sea reaches its warmest of the year, warmer than in June. You travel better, and for less.
In Algarve’s Sotavento, between Tavira and the Ria Formosa, at 22 to 25 °C. On the islands, Madeira offers 22 to 24 °C and Porto Santo reaches 25 °C in early autumn.
September is the grape-harvest season in the Douro. Several wine estates run programmes for visitors, with grape picking, treading in the lagar and Port wine tastings; dates and conditions vary from estate to estate, so it is worth booking ahead.
There are 35 Pousadas de Portugal properties, set in palaces, monasteries and castles. For September, the Pousada Mosteiro Amares, in a 12th-century monastery restored by Eduardo Souto de Moura between Braga and the Gerês, is a safe bet midweek.
As a rule, yes: September marks the shift from high to mid-season in leisure hotels, with more availability and better deals, especially from Sunday to Thursday. The exact size of the difference varies by hotel and by date, so it pays to compare nearby dates before booking.
