August in Luxembourg averages a daily high of 23.6°C with nights around 13.7°C. Expect roughly 11.8 wet days totalling 73mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Luxembourg is May–September.
Based on LUXEMBOURG AIRPORT, LU (5.4km), 1995–2024. 30 years of August data.