August in Porto averages a daily high of 25.1°C with nights around 15.7°C. Expect roughly 4.6 wet days totalling 32.7mm. 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 August data.