January in Grevenbroich averages a daily high of 5.9°C with nights around 0.9°C. Expect roughly 16.2 wet days totalling 61.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Grevenbroich is May–September.
Based on TONISVORST, GM (24.2km), 1995–2024. 30 years of January data.