Lisbon edges it in September. Lisbon averages 18–27°C with medium–high crowds; Porto 15–24°C with moderate-high crowds.
By Daan · Last reviewed October 2026
Lisbon and Porto
The verdict for September
The underrated winner
+Warm weather, long evenings and the summer atmosphere is still there as crowds ease.
–The first half can still feel and price like summer.
The same summer feeling, with a little more breathing room.
Warm days, harvest season
+Warm weather and seasonal wine experiences.
–Rainfall starts to increase and prices may remain elevated.
September often retains warm afternoons, while rainfall begins to increase. The wider Douro Valley can be particularly interesting during the grape harvest, although dates vary between vineyards and years.
Scores and crowd levels are my own judgement; temperatures are monthly averages. Higher scores are better: quieter, cheaper and more pleasant.
Another month