April in Luxembourg averages a daily high of 14.3°C with nights around 5°C. Expect roughly 10.9 wet days totalling 50.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Luxembourg is May–September.
Based on LUXEMBOURG AIRPORT, LU (5.4km), 1995–2024. 30 years of April data.