January in Deventer averages a daily high of 5.6°C with nights around 0.4°C. Expect roughly 16.2 wet days totalling 64.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Deventer is May–September.
Based on HEINO, NL (20.9km), 1995–2024. 30 years of January data.