December in Vallecas averages a daily high of 10.5°C with nights around 3.9°C. Expect roughly 7.9 wet days totalling 47mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Vallecas is May–June.
Based on MADRID RETIRO, SP (6.1km), 1995–2024. 30 years of December data.