Compare Diesel across 1,221 stations in Western Australia. Updated 10:59 PM, 06 Jun 2026.
Western Australia data source: Petrolmate sources Western Australian prices directly from
WA FuelWatch, the WA Government's 24-hour rule price scheme — WA retailers must publish their next-day prices by 2pm and hold them for 24 hours. We sync at 6am Perth time (9am AEDT).
Best day to fill up — Diesel in Western Australia
Fill up on Tue, avoid Wed
Perth follows a strict weekly price cycle. Prices jump sharply on Wednesday and then ease for the rest of the week, reaching their lowest point on Tuesday. Tuesday is the day to fill up in Perth. It is the cheapest point of the cycle, right before the Wednesday price hike.