West Coast less California diesel price in September 2026
2 official EIA weekly readings available so far
- The average West Coast less California on-highway diesel price in September 2026 was $6.440 per gallon, calculated from 2 EIA weekly readings available so far.
- The weekly low was $6.314; the weekly high was $6.566.
- That monthly average was $0.724 higher than August 2026.
- It was $2.305 higher than September 2025.
This is a calendar-month view of the official EIA weekly West Coast less California series. It averages only the source weeks listed below, not a separate government monthly estimate.
September 2026 weekly chart
Every EIA week in September 2026
| Week of | $/gal | Change |
|---|---|---|
| $6.314 | ▲+$0.442 | |
| $6.566 | ▲+$0.252 |
← August 2026 · all of 2026 · all West Coast less California history · monthly CSV
Download the underlying weekly EIA series or see the methodology and source cross-check.