April in Aachen averages a daily high of 13.3°C with nights around 4.2°C. Expect roughly 11.9 wet days totalling 49.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Aachen is June–September.
Based on NIDEGGEN SCHMIDT, GM (26.5km), 1995–2024. 30 years of April data.