According to COPEC, petrol is expected to increase by 4.24 per cent, while diesel could record a sharper 10.23 per cent rise during the second pricing window of September.
LPG is also projected to increase significantly, with the commodity expected to sell at approximately GH¢15.32 per kilogramme.
In a projection dated September 13, 2026, COPEC attributed the expected increases largely to a rise in international crude oil and refined petroleum product prices.
It said global crude oil prices increased from US$89.30 to US$103.07 per barrel during the period under review.
The development comes despite a marginal appreciation of the Ghana cedi against the US dollar, with the currency moving from an average interbank rate of GH¢11.5166 per US$1 at the beginning of the current pricing window to GH¢11.4830 at the close of the window.
COPEC said the appreciation represented a marginal 0.29 per cent improvement in the value of the cedi against the dollar.
Its analysis showed that the international Free on Board (FOB) price of petrol increased from US$1,136.50 to US$1,251.07 per metric tonne, representing a 10.08 per cent increase.
After accounting for the marginal appreciation of the cedi, COPEC projects that the retail price of petrol could rise to GH¢16.26 per litre.
That would represent a 4.24 per cent increase from the current mean price of GH¢15.60 per litre.
Based on its projection and an estimated ±5 per cent range, COPEC expects petrol to sell between GH¢15.44 and GH¢17.08 per litre during the next pricing window.
Diesel is expected to record a sharper increase.
COPEC said the FOB price of diesel rose from US$1,250.50 to US$1,404.73 per metric tonne, representing a 12.33 per cent increase.
After factoring in the 0.29 per cent appreciation of the cedi, COPEC projects a retail pump price of GH¢19.07 per litre for diesel in the next pricing window.
The projected price would represent a 10.23 per cent increase from the current mean price of GH¢17.30 per litre.
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