Oil Prices in September 2011: WTI & Brent Daily Prices and Monthly Average
WTI averaged $85.52 per barrel in September 2011, little changed from August 2011 ($86.33). A year earlier, in September 2010, it averaged $75.24, so the price was higher by $10.28 (13.7%) year over year.
Daily spot prices, September 2011
Chart data table (21 rows)
| Period | WTI | Brent |
|---|---|---|
| Sep 30, 2011 | $78.93 | $105.42 |
| Sep 29, 2011 | $81.87 | $107.08 |
| Sep 28, 2011 | $80.94 | $108.52 |
| Sep 27, 2011 | $84.18 | $109.54 |
| Sep 26, 2011 | $79.97 | $107.90 |
| Sep 23, 2011 | $79.58 | $109.17 |
| Sep 22, 2011 | $80.29 | $109.21 |
| Sep 21, 2011 | $85.77 | $114.26 |
| Sep 20, 2011 | $86.92 | $114.39 |
| Sep 19, 2011 | $85.70 | $112.89 |
| Sep 16, 2011 | $87.96 | $116.26 |
| Sep 15, 2011 | $89.40 | $116.71 |
| Sep 14, 2011 | $88.91 | $113.10 |
| Sep 13, 2011 | $90.21 | $114.08 |
| Sep 12, 2011 | $88.19 | $114.75 |
| Sep 9, 2011 | $87.24 | $115.10 |
| Sep 8, 2011 | $89.05 | $117.99 |
| Sep 7, 2011 | $89.34 | $117.50 |
| Sep 6, 2011 | $85.99 | $113.29 |
| Sep 2, 2011 | $86.45 | $115.92 |
| Sep 1, 2011 | $88.93 | $116.43 |
Prices fell over the month, from $88.93 on Sep 1, 2011 to $78.93 on Sep 30, 2011. The largest one-day move was −$5.48 on Sep 22, 2011 (−6.4%).
Brent averaged $112.83; its premium over WTI on matched dates averaged $27.32, with the daily Brent − WTI difference ranging from +$23.87 to +$29.59.
It was the lowest monthly average of 2011. Adjusted with CPI-U, the September 2011 average equals $127.00 in September 2026 dollars.
September 2011 summary
| Measure | WTI | Brent |
|---|---|---|
| Monthly average | $85.52 | $112.83 |
| Change vs August 2011 | −$0.81 | +$2.61 |
| Change vs September 2010 | +$10.28 | +$34.99 |
| Highest daily price | $90.21 Sep 13, 2011 | $117.99 Sep 8, 2011 |
| Lowest daily price | $78.93 Sep 30, 2011 | $105.42 Sep 30, 2011 |
| Published daily observations | 21 | 21 |
| Average in September 2026 dollars (CPI-U) | $127.00 | $167.56 |
Monthly averages are EIA's published figures. Real figures use CPI-U for September 2011.
Source and methodology
| Provider | Series | Units | Coverage | Latest observation |
|---|---|---|---|---|
| U.S. Energy Information Administration | RWTC — WTI spot price FOB (daily, monthly) | $/bbl | Sep 1, 2011 – Sep 30, 2011 | Sep 30, 2011 |
| U.S. Energy Information Administration | RBRTE — Brent spot price FOB (daily, monthly) | $/bbl | Sep 1, 2011 – Sep 30, 2011 | Sep 30, 2011 |
| 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:2011 daily prices (CSV)