September in Weimar averages a daily high of 19.5°C with nights around 10.3°C. Expect roughly 10.9 wet days totalling 56.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Weimar is May–September.
Based on WEIMAR SCHONDORF, GM (4.7km), 1995–2024. 18 years of September data.