Portugal in September: Weather, Crowds & What to Expect

Northern Portugal (Porto, Minho, Douro)

September cools noticeably at night and becomes ideal for visiting wineries as the grape harvest begins across the Douro - mornings are crisp, afternoons warm. Boat schedules run normally and river scenery is dramatic with workers in the terraces; it’s a top month for photos and wine tastings. Rain is still limited but increases later in the month; bring a light jacket for cooler nights.

Central Portugal & Serra da Estrela (Coimbra, Aveiro, mountains)

September cools gently, perfect for vineyard tours near the Dão region and scenic drives across the central mountain passes as leaves start to shift. The mayoress of Coimbra’s university town feels lively with the academic year restarting; trails are less crowded and swimming spots still comfortable. Bring a mix of summer and autumn layers and a light rain jacket for sudden coastal squalls.

Lisbon & Tagus Valley (Lisbon, Cascais, Sintra, Évora)

September cools to very pleasant temperatures and is one of the best months to visit Lisbon: the sea is still warm enough for swimming and the city enjoys long sunny days with fewer crowds. The wine harvest starts inland, and Sintra’s trails are excellent for walking. Pack light summer clothes plus a light jacket for evenings; it’s ideal for combining city time with short coastal escapes.

Alentejo & Interior South (Évora plains, Alentejo hills)

September cools pleasantly by stages: early month still feels summery and vineyard harvest activity begins in parts of the Alentejo. The weather is excellent for exploring open-air archaeological sites and castles with manageable crowds and comfortable daytime temperatures. Bring layers for cooler mornings and enjoy longer daylight for scenic drives and winery visits.

Algarve (Faro, Lagos, Sagres, eastern coast)

September cools slowly and is one of the best months for visiting - warm sea temperatures, lower crowds and long sunny days make boat trips and island hopping (to the Desertas) particularly pleasant. Surf remains consistent on the west, while the south-facing beaches are calm for swimming. Bring lighter clothing with a warm layer for evenings and enjoy post-summer bargains on activities.

Madeira (Funchal, levadas, high peaks)

September keeps warm sea temperatures and comfortable hiking weather, while hurricane risk is low though distant tropical systems can occasionally bring unsettled seas. This is a favored month for swimming, diving and bird and cetacean watching since water is at its calmest and clearest. Bring reef shoes and a light layer for evening walks through town squares and gardens.

Azores (São Miguel, Pico, Faial, Flores)

September cools gradually and becomes excellent for whale-watching as animals prepare to migrate; sea conditions are still generally calm in early month. Hikes on Azorean mountains are rewarding with clear air and fewer crowds than summer. Expect some increased Atlantic systems later in the month; pack layers and a waterproof for the occasional wild day.