January in Ljubljana averages a daily high of 4.2°C with nights around -1.7°C. Expect roughly 9.6 wet days totalling 75mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Ljubljana is May–September.
Based on LJUBLJANA BEZIGRAD, SI (1.9km), 1995–2024. 29 years of January data.