December in Cadiz averages a daily high of 17.2°C with nights around 11.2°C. Expect roughly 8.7 wet days totalling 86mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Cadiz is May–September.
Based on CADIZ, SP (4.1km), 1995–2024. 28 years of December data.