December in Thembisa averages a daily high of 28.3°C with nights around 15.9°C. Expect roughly 17.9 wet days totalling 124.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Thembisa is May–September.
Based on PRETORIA IRENE, SF (8.9km), 1995–2024. 29 years of December data.