April in Ljubljana averages a daily high of 17.3°C with nights around 6.3°C. Expect roughly 11.6 wet days totalling 95.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ljubljana is May–September.
Based on LJUBLJANA BEZIGRAD, SI (1.9km), 1995–2024. 29 years of April data.