July in Koblenz averages a daily high of 24.3°C with nights around 12.6°C. Expect roughly 13.6 wet days totalling 71.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Koblenz is June–September.
Based on MONTABAUR, GM (18.7km), 1995–2024. 17 years of July data.