August in Liège averages a daily high of 23.7°C with nights around 13.6°C. Expect roughly 13.5 wet days totalling 86.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Liège is May–September.
Based on MAASTRICHT, NL (33.1km), 1995–2024. 30 years of August data.