January in Viladecans averages a daily high of 14.1°C with nights around 5.7°C. Expect roughly 5.4 wet days totalling 36.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Viladecans is May–July.
Based on BARCELONA AEROPUERTO, SP (5.2km), 1995–2024. 30 years of January data.