January in Luxembourg averages a daily high of 3.7°C with nights around -0.9°C. Expect roughly 15.4 wet days totalling 71.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Luxembourg is May–September.
Based on LUXEMBOURG AIRPORT, LU (5.4km), 1995–2024. 30 years of January data.