January in Koblenz averages a daily high of 4.2°C with nights around -1.1°C. Expect roughly 16.5 wet days totalling 75.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Koblenz is June–September.
Based on MONTABAUR, GM (18.7km), 1995–2024. 17 years of January data.