January in Hoorn averages a daily high of 6.2°C with nights around 1.3°C. Expect roughly 18.2 wet days totalling 75.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Hoorn is June–September.
Based on BERKHOUT, NL (5.5km), 1995–2024. 25 years of January data.