"It is being fanned by a strong easterly wind‚" said Cape Town fire chief Danie Wilds.
Farming communities in the Hawequas Mountains were evacuated from their homes on Thursday.
The raging fire had closed the Du Toitskloof Pass‚ with traffic being redirected. The pass was ablaze last month too.
Wilds said no injuries had been reported yet.
The province has experienced some its fiercest fires recently‚ due in part to the national drought. Last month it was reported that since the start of this year‚ Western Cape fire services have been called to 620 fires‚ with 90% being extinguished within the first hour of responding.
There have been suggestions that some of the fires are as a result of arson and City of Cape Town officials are investigating this possibility.
Here are some photographs of the blaze captured throughout the day on Thursday: