September in Germiston averages a daily high of 24.1°C with nights around 9.8°C. Expect roughly 4.6 wet days totalling 13.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Germiston is April–September.
Based on JOHANNESBURG INTERNATIONAL, SF (12.7km), 1995–2024. 20 years of September data.