Germiston's climate is characterized by a mild winter with temperatures ranging from 0-26°C, while summer months bring warmer temperatures with averages around 22-24°C. Spring and autumn are relatively cool, with temperatures averaging between 14-20°C. The coldest month is July, with an average temperature of 10°C, while the warmest months are December to February, with averages ranging from 19-22°C. Overnight temperatures can drop significantly, especially in winter, with January being the only month with sub-zero temperatures recorded. Daytime temperatures in summer can reach as high as 36°C.