January in Tarija averages a daily high of 28.2°C with nights around 15.6°C. Expect roughly 17 wet days totalling 138.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Tarija is April–October.
Based on TARIJA, BL (3.5km), 1995–2024. 17 years of January data.