September in Porto averages a daily high of 23.5°C with nights around 14.9°C. Expect roughly 7.8 wet days totalling 74.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Porto is June–September.
Based on PORTO, PO (1.9km), 1995–2024. 17 years of September data.