WA Diesel Climbs 17 Cents in a Day While Five Suburbs Hold Under 235
According to pricing data collected at 2:04pm AEST on Saturday 8th Aug 2026, diesel in Western Australia averages 252.4 cents per litre across the state's 1,224 reporting stations, up 17.5 cents on Friday's 234.9. That is a rise of 7.45 per cent in a single day, the largest movement any state has produced this week, and it has reordered the national diesel table.
From cheapest to fourth overnight
On Friday, WA held the cheapest average diesel prices of any Australian state. By Saturday afternoon it sat fourth. Six states now sit inside a narrow band: NSW averages 250.8, Queensland 251.7, Victoria 252.0, WA 252.4, Tasmania 252.8 and South Australia 253.6. That is a spread of 2.8 cents across six states and more than 5,000 reporting stations. With averages that close, which state you buy in has very little effect on what you pay. Which suburb you buy in is a different story.
When I analysed the national diesel market at the end of July, six states sat within 2.2 cents of one another while the Northern Territory traded 39 cents above the pack. The cluster has held. WA has moved from the floor of that band to near its ceiling. The Territory remains the outlier at 284.7 cents, still more than 31 cents clear of the dearest state in the group.
Why the increase arrived in one step
Under the state's FuelWatch scheme, WA stations set their prices at 6am and hold them for 24 hours. When wholesale costs rise, the increase lands as one visible step rather than trickling through over several days the way it does in the eastern states. Saturday's data shows exactly that, with hundreds of sites resetting at once.
The state's internal spread stretched to 176.3 cents, the widest of any state outside the Territory. The cheapest diesel in WA on Saturday was 213.7 cents and the dearest remote site listed 390.0. Distance from Perth's fuel terminals is still the single biggest pricing factor in the west.
Where the value is holding
Five of the six cheapest diesel suburbs in the country are in WA. Only Bomaderry on the NSW South Coast breaks the pattern, which is an odd thing to write on the day the state average climbed 17.5 cents.
The Wheatbelt town of Darkan leads the nation at 231.4 cents across its four stations, with just 5 cents separating them. In the Perth metro area, Bassendean averages 233.6, Kwinana Beach 233.9, Beckenham 234.4 and Forrestfield 234.6. Forrestfield's cheapest site listed 224.9 on Saturday, and Ocean Reef posted the lowest single metro price at 227.5.
Regional buyers need to be more selective. In Katanning, the seven local stations ranged from 227.9 to 263.9, a 36 cent gap within one town. That single decision about which servo to use is worth $21.60 on a 60 litre tank.
What it means at the pump
For a motorist filling a 60 litre ute at Saturday's state average of 252.4, the bill comes to $151.44. Filling at Kwinana Beach's cheapest site at 227.9 brings that down to $136.74, a saving of $14.70 on a single fill. Historical data suggests moves of this size in WA are often followed by a period of stability under the daily pricing rule, so it is worth watching the price trends data over the coming week rather than assuming further increases are on the way.
NSW was the only state to ease, down 1.4 cents to 250.8, with the cheapest site in the state listing 201.8.
Location and timing remain the two levers that matter in fuel savings. WA's average climbed 17.5 cents overnight, but a handful of its suburbs barely moved at all.
