Oil Prices in September 1999: WTI & Brent Daily Prices and Monthly Average
WTI's monthly average rose to $23.80 in September 1999, up $2.52 (11.8%) from August 1999, the highest monthly average in nominal terms since January 1997. The average was 58% above the $15.03 of September 1998.
Daily spot prices, September 1999
Chart data table (22 rows; WTI on 21, Brent on 22)
| Period | WTI | Brent |
|---|---|---|
| Sep 30, 1999 | $24.54 | $22.98 |
| Sep 29, 1999 | $24.69 | $23.46 |
| Sep 28, 1999 | $24.52 | $23.24 |
| Sep 27, 1999 | $24.63 | $23.60 |
| Sep 24, 1999 | $24.81 | $23.66 |
| Sep 23, 1999 | $24.76 | $23.41 |
| Sep 22, 1999 | $24.26 | $22.49 |
| Sep 21, 1999 | $24.48 | $22.68 |
| Sep 20, 1999 | $24.32 | $22.85 |
| Sep 17, 1999 | $24.72 | $22.93 |
| Sep 16, 1999 | $24.52 | $23.06 |
| Sep 15, 1999 | $24.10 | $23.25 |
| Sep 14, 1999 | $23.86 | $23.18 |
| Sep 13, 1999 | $24.18 | $22.98 |
| Sep 10, 1999 | $23.55 | $22.36 |
| Sep 9, 1999 | $23.24 | $22.51 |
| Sep 8, 1999 | $22.64 | $21.96 |
| Sep 7, 1999 | $22.58 | $21.71 |
| Sep 6, 1999 | — | $21.14 |
| Sep 3, 1999 | $22.00 | $20.74 |
| Sep 2, 1999 | $21.54 | $20.66 |
| Sep 1, 1999 | $21.79 | $21.10 |
Prices rose over the month, from $21.79 on Sep 1, 1999 to $24.54 on Sep 30, 1999, with gains on 13 of 21 trading days.
Brent averaged $22.54, on matched dates $1.19 below WTI on average across 21 dates.
Among the 41 September averages EIA has published, 1999's ranks 12th lowest. Within 1999 it ranks 3rd highest of the 12 monthly averages. The high was $24.81 on Sep 24, 1999 and the low $21.54 on Sep 2, 1999. In October 2026 dollars (CPI-U), the average equals $47.84 and the high of $24.81 equals $49.87.
September 1999 summary
| Measure | WTI | Brent |
|---|---|---|
| Monthly average | $23.80 | $22.54 |
| Change vs August 1999 | +$2.52 | +$2.32 |
| Change vs September 1998 | +$8.77 | +$9.20 |
| Highest daily price | $24.81 Sep 24, 1999 | $23.66 Sep 24, 1999 |
| Lowest daily price | $21.54 Sep 2, 1999 | $20.66 Sep 2, 1999 |
| Published daily observations | 21 | 22 |
| Average in October 2026 dollars (CPI-U) | $47.84 | $45.31 |
Monthly averages are EIA's published figures. Real figures use CPI-U for September 1999.
September in other years
| Year | WTI average | vs September 1999 | Real |
|---|---|---|---|
| 2026 | $97.31 | +308.9% | $97.47 |
| 2025 | $63.96 | +168.7% | $66.46 |
| 2024 | $70.24 | +195.1% | $75.19 |
| 2023 | $89.43 | +275.8% | $98.07 |
| 2022 | $84.26 | +254.0% | $95.82 |
| 2021 | $71.65 | +201.1% | $88.16 |
| 2020 | $39.63 | +66.5% | $51.39 |
| 2019 | $56.95 | +139.3% | $74.86 |
| 2018 | $70.23 | +195.1% | $93.90 |
| 2017 | $49.82 | +109.3% | $68.13 |
| 2016 | $45.18 | +89.8% | $63.16 |
| 2015 | $45.48 | +91.1% | $64.51 |
| 2014 | $93.21 | +291.6% | $132.17 |
| 2013 | $106.29 | +346.6% | $153.21 |
| 2012 | $94.51 | +297.1% | $137.84 |
| 2011 | $85.52 | +259.3% | $127.22 |
| 2010 | $75.24 | +216.1% | $116.25 |
| 2009 | $69.41 | +191.6% | $108.47 |
| 2008 | $104.11 | +337.4% | $160.61 |
| 2007 | $79.92 | +235.8% | $129.38 |
| 2006 | $63.80 | +168.1% | $106.13 |
| 2005 | $65.59 | +175.6% | $111.35 |
| 2004 | $45.94 | +93.0% | $81.65 |
| 2003 | $28.31 | +18.9% | $51.59 |
| 2002 | $29.66 | +24.6% | $55.31 |
| 2001 | $26.20 | +10.1% | $49.59 |
| 2000 | $33.88 | +42.4% | $65.83 |
| 1999 | $23.80 | — | $47.84 |
| 1998 | $15.03 | −36.8% | $31.01 |
| 1997 | $19.80 | −16.8% | $41.46 |
| 1996 | $23.97 | +0.7% | $51.27 |
| 1995 | $18.23 | −23.4% | $40.16 |
| 1994 | $17.45 | −26.7% | $39.42 |
| 1993 | $17.50 | −26.5% | $40.71 |
| 1992 | $21.88 | −8.1% | $52.26 |
| 1991 | $21.89 | −8.0% | $53.85 |
| 1990 | $33.51 | +40.8% | $85.23 |
| 1989 | $19.59 | −17.7% | $52.89 |
| 1988 | $14.54 | −38.9% | $40.96 |
| 1987 | $19.53 | −17.9% | $57.32 |
| 1986 | $14.87 | −37.5% | $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 1999.
Source and methodology
| Provider | Series | Units | Coverage | Latest observation |
|---|---|---|---|---|
| U.S. Energy Information Administration | RWTC — WTI spot price FOB (daily, monthly) | $/bbl | Sep 1, 1999 – Sep 30, 1999 | Sep 30, 1999 |
| U.S. Energy Information Administration | RBRTE — Brent spot price FOB (daily, monthly) | $/bbl | Sep 1, 1999 – Sep 30, 1999 | Sep 30, 1999 |
| 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:1999 daily prices (CSV)