The South African Weather Service SAWS has issued a yellow level two weather alert for severe thunderstorms across Gauteng, KwaZulu-Natal, Mpumlanga, Limpopo and the Free State for Saturday.
Residents in low-lying areas are advised to take extra precaution due to potential localised flooding.
Forecaster Lehlohonolo Thobela says the warning applies especially for the eastern parts of Gauteng into the southern parts of Limpopo as well as Mpumalanga and the western interior of KwaZulu-Natal and the Free State.