December in Sidoarjo averages a daily high of 32.8°C with nights around 24.9°C. Expect roughly 6 wet days totalling 98.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sidoarjo is May–September.
Based on SURABAYA JUANDA, ID (10.7km), 1995–2024. 18 years of December data.