California diesel price in September 2025
5 official EIA weekly readings
- The average California on-highway diesel price in September 2025 was $4.962 per gallon, calculated from 5 EIA weekly readings.
- The weekly low was $4.914; the weekly high was $4.985.
- That monthly average was $0.067 higher than August 2025.
- It was $0.229 higher than September 2024.
This is a calendar-month view of the official EIA weekly California series. It averages only the source weeks listed below, not a separate government monthly estimate.
September 2025 weekly chart
Every EIA week in September 2025
| Week of | $/gal | Change |
|---|---|---|
| $4.914 | ▲+$0.041 | |
| $4.958 | ▲+$0.044 | |
| $4.971 | ▲+$0.013 | |
| $4.985 | ▲+$0.014 | |
| $4.981 | ▼−$0.004 |
← August 2025 · October 2025 → · all of 2025 · all California history · monthly CSV
Download the underlying weekly EIA series or see the methodology and source cross-check.