January in Groningen averages a daily high of 5.3°C with nights around 0.1°C. Expect roughly 17.4 wet days totalling 74.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Groningen is May–September.
Based on EELDE, NL (10.7km), 1995–2024. 30 years of January data.