Oil Prices in September 2005: WTI & Brent Daily Prices and Monthly Average
At $65.59 per barrel, September 2005's WTI average was the highest monthly average in nominal terms since EIA's records began in 1986, up $0.60 (0.9%) from August 2005. The average was 43% above the $45.94 of September 2004.
Daily spot prices, September 2005
Chart data table (22 rows)
| Period | WTI | Brent |
|---|---|---|
| Sep 30, 2005 | $66.21 | $61.70 |
| Sep 29, 2005 | $66.83 | $62.02 |
| Sep 28, 2005 | $66.36 | $62.81 |
| Sep 27, 2005 | $64.94 | $62.56 |
| Sep 26, 2005 | $65.98 | $61.73 |
| Sep 23, 2005 | $64.67 | $62.17 |
| Sep 22, 2005 | $67.07 | $64.64 |
| Sep 21, 2005 | $66.96 | $64.31 |
| Sep 20, 2005 | $66.24 | $62.98 |
| Sep 19, 2005 | $67.21 | $64.04 |
| Sep 16, 2005 | $62.91 | $60.48 |
| Sep 15, 2005 | $64.64 | $61.90 |
| Sep 14, 2005 | $65.20 | $61.70 |
| Sep 13, 2005 | $63.18 | $61.31 |
| Sep 12, 2005 | $63.29 | $60.69 |
| Sep 9, 2005 | $64.21 | $62.62 |
| Sep 8, 2005 | $64.80 | $61.66 |
| Sep 7, 2005 | $64.38 | $63.60 |
| Sep 6, 2005 | $65.83 | $64.16 |
| Sep 5, 2005 | — | $64.16 |
| Sep 2, 2005 | $66.91 | $65.95 |
| Sep 1, 2005 | $69.50 | $66.79 |
The month's range ran from $62.91 on Sep 16, 2005 to $69.50 on Sep 1, 2005; the last price was $66.21 on Sep 30, 2005. The largest one-day move was +$4.30 on Sep 19, 2005 (+6.8%).
Brent traded below WTI on average this month: $62.91 for the month, $2.74 under WTI across 21 matched dates.
It was the highest monthly average of 2005. Adjusted with CPI-U, the September 2005 average equals $111.17 in September 2026 dollars.
September 2005 summary
| Measure | WTI | Brent |
|---|---|---|
| Monthly average | $65.59 | $62.91 |
| Change vs August 2005 | +$0.60 | −$1.07 |
| Change vs September 2004 | +$19.65 | +$19.71 |
| Highest daily price | $69.50 Sep 1, 2005 | $66.79 Sep 1, 2005 |
| Lowest daily price | $62.91 Sep 16, 2005 | $60.48 Sep 16, 2005 |
| Published daily observations | 21 | 22 |
| Average in September 2026 dollars (CPI-U) | $111.17 | $106.62 |
Monthly averages are EIA's published figures. Real figures use CPI-U for September 2005.
Source and methodology
| Provider | Series | Units | Coverage | Latest observation |
|---|---|---|---|---|
| U.S. Energy Information Administration | RWTC — WTI spot price FOB (daily, monthly) | $/bbl | Sep 1, 2005 – Sep 30, 2005 | Sep 30, 2005 |
| U.S. Energy Information Administration | RBRTE — Brent spot price FOB (daily, monthly) | $/bbl | Sep 1, 2005 – Sep 30, 2005 | Sep 30, 2005 |
| U.S. Bureau of Labor Statistics | CUUR0000SA0 — CPI-U, all items, NSA | index, 1982–84=100 | monthly | September 2026 |
Last updated: Oct 21, 2026, 5:27 PM CDT. Raw values are shown in source units; any conversion is labeled. See methodology and data sources.
Download:2005 daily prices (CSV)