May in Aveiro averages a daily high of 20°C with nights around 12°C. Expect roughly 10.5 wet days totalling 77.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Aveiro is June–September.
Based on PORTO, PO (54.3km), 1995–2024. 16 years of May data.