December in Weimar averages a daily high of 4.6°C with nights around -0.1°C. Expect roughly 13.9 wet days totalling 38.4mm. 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. 18 years of December data.