Oil Prices in September 1991: WTI & Brent Daily Prices and Monthly Average
WTI averaged $21.89 per barrel in September 1991, little changed from August 1991 ($21.69). The average was 35% below the $33.51 of September 1990.
Daily spot prices, September 1991
Chart data table (21 rows; WTI on 20, Brent on 21)
| Period | WTI | Brent |
|---|---|---|
| Sep 30, 1991 | $22.25 | $21.43 |
| Sep 27, 1991 | $22.42 | $21.48 |
| Sep 26, 1991 | $22.23 | $21.00 |
| Sep 25, 1991 | $22.11 | $20.65 |
| Sep 24, 1991 | $22.24 | $20.75 |
| Sep 23, 1991 | $22.20 | $20.83 |
| Sep 20, 1991 | $22.02 | $20.55 |
| Sep 19, 1991 | $21.79 | $20.43 |
| Sep 18, 1991 | $21.87 | $20.53 |
| Sep 17, 1991 | $21.73 | $20.30 |
| Sep 16, 1991 | $21.84 | $20.53 |
| Sep 13, 1991 | $21.71 | $20.35 |
| Sep 12, 1991 | $21.51 | $20.25 |
| Sep 11, 1991 | $21.66 | $20.00 |
| Sep 10, 1991 | $21.44 | $19.93 |
| Sep 9, 1991 | $21.36 | $19.85 |
| Sep 6, 1991 | $21.56 | $20.13 |
| Sep 5, 1991 | $21.75 | $20.10 |
| Sep 4, 1991 | $21.76 | $20.25 |
| Sep 3, 1991 | $22.28 | $20.55 |
| Sep 2, 1991 | — | $20.65 |
Daily prices stayed within $1.06, from $21.36 (Sep 9, 1991) to $22.42 (Sep 27, 1991).
Brent averaged $20.50, on matched dates $1.39 below WTI on average across 20 dates.
Among the 41 September averages EIA has published, 1991's ranks 11th lowest. Within 1991 it ranks 4th highest of the 12 monthly averages. In October 2026 dollars (CPI-U), the average equals $53.85 and the high of $22.42 equals $55.15.
September 1991 summary
| Measure | WTI | Brent |
|---|---|---|
| Monthly average | $21.89 | $20.50 |
| Change vs August 1991 | +$0.20 | +$0.73 |
| Change vs September 1990 | −$11.62 | −$14.40 |
| Highest daily price | $22.42 Sep 27, 1991 | $21.48 Sep 27, 1991 |
| Lowest daily price | $21.36 Sep 9, 1991 | $19.85 Sep 9, 1991 |
| Published daily observations | 20 | 21 |
| Average in October 2026 dollars (CPI-U) | $53.85 | $50.43 |
Monthly averages are EIA's published figures. Real figures use CPI-U for September 1991.
September in other years
| Year | WTI average | vs September 1991 | Real |
|---|---|---|---|
| 2026 | $97.31 | +344.5% | $97.47 |
| 2025 | $63.96 | +192.2% | $66.46 |
| 2024 | $70.24 | +220.9% | $75.19 |
| 2023 | $89.43 | +308.5% | $98.07 |
| 2022 | $84.26 | +284.9% | $95.82 |
| 2021 | $71.65 | +227.3% | $88.16 |
| 2020 | $39.63 | +81.0% | $51.39 |
| 2019 | $56.95 | +160.2% | $74.86 |
| 2018 | $70.23 | +220.8% | $93.90 |
| 2017 | $49.82 | +127.6% | $68.13 |
| 2016 | $45.18 | +106.4% | $63.16 |
| 2015 | $45.48 | +107.8% | $64.51 |
| 2014 | $93.21 | +325.8% | $132.17 |
| 2013 | $106.29 | +385.6% | $153.21 |
| 2012 | $94.51 | +331.7% | $137.84 |
| 2011 | $85.52 | +290.7% | $127.22 |
| 2010 | $75.24 | +243.7% | $116.25 |
| 2009 | $69.41 | +217.1% | $108.47 |
| 2008 | $104.11 | +375.6% | $160.61 |
| 2007 | $79.92 | +265.1% | $129.38 |
| 2006 | $63.80 | +191.5% | $106.13 |
| 2005 | $65.59 | +199.6% | $111.35 |
| 2004 | $45.94 | +109.9% | $81.65 |
| 2003 | $28.31 | +29.3% | $51.59 |
| 2002 | $29.66 | +35.5% | $55.31 |
| 2001 | $26.20 | +19.7% | $49.59 |
| 2000 | $33.88 | +54.8% | $65.83 |
| 1999 | $23.80 | +8.7% | $47.84 |
| 1998 | $15.03 | −31.3% | $31.01 |
| 1997 | $19.80 | −9.5% | $41.46 |
| 1996 | $23.97 | +9.5% | $51.27 |
| 1995 | $18.23 | −16.7% | $40.16 |
| 1994 | $17.45 | −20.3% | $39.42 |
| 1993 | $17.50 | −20.1% | $40.71 |
| 1992 | $21.88 | 0.0% | $52.26 |
| 1991 | $21.89 | — | $53.85 |
| 1990 | $33.51 | +53.1% | $85.23 |
| 1989 | $19.59 | −10.5% | $52.89 |
| 1988 | $14.54 | −33.6% | $40.96 |
| 1987 | $19.53 | −10.8% | $57.32 |
| 1986 | $14.87 | −32.1% | $45.54 |
“—” in the real column means BLS has published no CPI-U for that month. The comparison column shows how far that year's average was from September 1991.
Source and methodology
| Provider | Series | Units | Coverage | Latest observation |
|---|---|---|---|---|
| U.S. Energy Information Administration | RWTC — WTI spot price FOB (daily, monthly) | $/bbl | Sep 3, 1991 – Sep 30, 1991 | Sep 30, 1991 |
| U.S. Energy Information Administration | RBRTE — Brent spot price FOB (daily, monthly) | $/bbl | Sep 2, 1991 – Sep 30, 1991 | Sep 30, 1991 |
| U.S. Bureau of Labor Statistics | CUUR0000SA0 — CPI-U, all items, NSA | index, 1982–84=100 | monthly | October 2026 |
Last updated: Nov 10, 2026, 7:01 PM CST. Raw values are shown in source units; any conversion is labeled. See methodology and data sources.
Download:1991 daily prices (CSV)