Petrol and diesel prices in Western Australia today

How have WA petrol prices moved?

Over the 80 days since 14 July 2026, unleaded in Western Australia has ranged between 173.2 and 240.7 c/L, a spread of 67.5 c/L. The typical day-to-day move is 3.3 c/L, and the largest single day move was +18.2 c/L on 5 August 2026. That makes WA the most restless market in the country - its unleaded median moves further on a typical day than any of the other 7 jurisdictions, which is what a weekly cycle does to an average. The median also stood still on 3 of the last 14 days. That is the panel rather than the market: a median only moves when the middle site reprices, and Western Australia has few enough reporting sites for that to be a quiet event.

Is petrol cheaper in Perth or regional WA?

Regional Western Australia is paying 1.9 c/L more than Greater Perth today. Across the whole window the gap has averaged 7.4 c/L over 80 days, the widest capital-to-country premium of the 5 jurisdictions publishing a split. It does not always run that way, though: across the window the gap ranged from -7.0 to 18.0 c/L, and on at least one day Greater Perth was the dearer of the two. Greater Perth and the rest of Western Australia are not discounting in step, so in Western Australia the country premium is a tendency worth checking rather than a rule to plan around. Greater Perth is the ABS Greater Capital City area; everything outside it counts as regional.

Sub-averages as at 1 October 2026.

Does Western Australia have a petrol price cycle?

Yes, and it runs on a weekly clock. Across 11 weeks of our own WA readings, Wednesday is the day prices jump: unleaded has risen an average of 11.5 c/L on a Wednesday, against small changes on every other day. That matches what the ACCC records for Perth, which it describes as weekly with the spike on a Wednesday. If you can choose when to fill up, the days before Wednesday are the cheap end of that cycle.

How Perth behaves, per the ACCC: The most predictable cycle in the country, and the one still running. Recent cycles are exactly 7 days, with the trough on a Tuesday and the peak on the Wednesday immediately after. At that length our 80 day window has watched 11 complete cycles through, which is why the weekday table below is a description of this season rather than a rule. Its guidance on timing a fill-up here: Tuesday (day before the typical Wednesday spike).

Mean day-over-day change in the WA unleaded median, by day of the week, over 79 consecutive-day pairs. A short window: treat it as this season's pattern rather than a permanent one. The cycle length, the description of Perth and the timing guidance above are the ACCC Petrol Price Cycles in the 5 Largest Cities, last reviewed 18 August 2026; the weekday figures and the movement statistics are our own.

What do WA retailers charge above the wholesale price?

The Australian Institute of Petroleum publishes a terminal gate price for Western Australia: what fuel costs leaving the terminal, before a retailer's own costs and margin. On 1 October 2026 that was 229.4 c/L for unleaded, against a pump median of 240.3 c/L - a gap of 10.9 c/L, and 20.1 c/L on diesel. That gap is not profit. It covers freight from the terminal, the site's own running costs, and whatever margin the retailer is taking.

Wholesale in Perth: 229.4 c/L on 1 October 2026, up 0.3 c/L on a week earlier. Direction steady: the latest five trading days against the five before, +0.5 per cent. How the direction is called.

The wholesale figure is published on weekdays and normally runs a day or two behind the pump figure, so the two dates above will rarely match exactly. The full build-up from barrel to bowser.

Where these WA fuel prices come from

Every figure on this page comes from WA FuelWatch, run by the WA Government. It is a next day price schedule rather than a live feed - FuelWatch publishes tomorrow's prices each afternoon, by 2:30pm AWST. We read it twice a day, take the median across the sites reporting, and publish it unaltered. We do not model, smooth or forecast the price.

That data is published under CC BY 4.0.

Fuel excise is the same in every state

Fuel excise is a Commonwealth tax, so it is identical in Western Australia and everywhere else. It returned to 53.7 c/L on 3 August 2026, worth up to about 18.8 c/L at the pump once GST is applied. Differences between states come from freight, competition and local costs, never from tax. What fuel excise costs per tank.

How these figures are derived: pricing methodology. Ways to pay less: save on fuel. Timing a fill-up in WA: should I fill up today?