January in Weimar averages a daily high of 3.1°C with nights around -1.6°C. Expect roughly 13.9 wet days totalling 31.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Weimar is May–September.
Based on WEIMAR SCHONDORF, GM (4.7km), 1995–2024. 17 years of January data.