January in Tarragona averages a daily high of 14.7°C with nights around 3.7°C. Expect roughly 5.2 wet days totalling 29.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Tarragona is March–July.
Based on REUS AEROPUERTO, SP (6.5km), 1995–2024. 30 years of January data.