December in Kāshān averages a daily high of 13°C with nights around 1.7°C. Expect roughly 3.8 wet days totalling 11.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kāshān is March–April.
Based on KASHAN, IR (17.5km), 1995–2024. 19 years of December data.