The province has been experiencing heavy downpours since Thursday.
The weather service issued a warning of severe thunderstorms in KZN earlier on Tuesday saying further rainfall could result in damaging impacts for some areas.
The South African Weather Service said Monday was the hottest day of the week, with temperatures in parts of Mpumalanga and Limpopo having reached highs of 42 degrees.
The rain comes as Gauteng residents have been urged to use water sparingly.
The province simmered in hot conditions this week with temperatures peaking between 34 and 35 degrees in some areas.
This weekend, the Swartberg mountain range, Matroosberg and even parts of Greyton experienced snow.
In some parts of the country, including in Soweto and Vereeniging, residents have woken up to freezing temperatures, with the mercury dipping to minus one, and only expected to reach maximums of around 13 degrees Celsius.
Gale force winds were expected to also whip the Cape Peninsula and rough sea conditions.
Heavy rains were battering the Cape Town on Tuesday afternoon.
The South African Weather Service has warned of extreme weather conditions throughout the country with major thunderstorms and heavy rains.
This is expected to result in heavy traffic delays, with Eskom also announcing stage 2 load shedding for Thursday.
Senior forecaster at the SA Weather Service Puseletso Mofokeng says in terms of natural disasters, lightning is the number one killer in the country.
An alert for a severe thunderstorm has been issued for KwaZulu-Natal and the Eastern Cape.
The weather service says the heatwave takes hold on Sunday and is expected to last until about Wednesday with temperatures rising to the high 30s.
Forecasters say that heavy rains will begin on Monday afternoon and continue into Tuesday morning.
The South African Weather Service says hot conditions will continue into Saturday.
The South African Weather Service has warned of strong and damaging winds which will occur along with thunderstorms.
The SA Weather Service says snowfall is also expected in some southern and northern parts of the Drakensberg.
