July in Trier averages a daily high of 25.2°C with nights around 13.6°C. Expect roughly 12.7 wet days totalling 75.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Trier is May–September.
Based on TRIER PETRISBERG, GM (1.6km), 1995–2024. 29 years of July data.