The Automobile Association (AA) expects an increase of 32 cents a litre (c/l) for petrol and 30c/l for diesel next month, Ladysmith Gazette reports.
Illuminating paraffin is likely to jump by 22 cents, if current trends continue.
The AA based its estimation on unaudited data from the Central Energy Fund.
At the beginning of this month (June), petrol increased by 82 cents a litre, while diesel climbed by 85c/l.
This pushed prices to record levels, a trend that looks set to continue, much to the dismay of motorists.