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# ASX 200 falls to June low as oil near US$110 fans inflation fears
- URL: https://www.promptthemarket.com/asx-200-drops-to-june-low-as-oil-near-us-110-fans-inflation-fears/
- Published: 2026-09-15T09:00:00.000Z
- Updated: 2026-10-14T03:28:38.000Z
- Description: The S&P/ASX 200 closed at 8,741.21 on 11 September 2026, down 0.89% for the session. That puts the index at its lowest point since June, and the driver is not hard to find. Brent crude sat at US$109.51 a barrel on 9 September, closing in on US$110 for the first time in months.
- Author: Editor News
- Tags: Finance, #author-james-dore, #by James Dore

![James Dore](https://storage.ghost.io/c/e4/01/e4017178-c1da-4131-80aa-35f02cb5b999/content/images/2026/09/james-dore.jpg)

By **James Dore** · 2026-09-15

TLDR

The Australian Securities Exchange (ASX) 200 closed at 8,741.21 on 11 September, down 0.89%, its lowest since June, as Brent crude near US$110 a barrel pushed inflation fears back to the front. Australian CPI sits at 3.5%, above the Reserve Bank of Australia (RBA)'s target, and the next reading lands one day after the board meets on 29 September.

KEY TAKEAWAYS

01The ASX 200 closed at 8,741.21 on 11 September 2026, down 0.89%, its lowest level since June.

02Brent crude sat at US$109.51 a barrel on 9 September, pressing directly on fuel and housing costs.

03Australian CPI rose 3.5% in the year to July 2026, above the RBA's 2 to 3% target band.

04The next CPI print arrives 30 September, one day after the RBA's scheduled 29 September meeting.

05Futures markets implied a cash rate of 4.35% as of 18 August, pricing no cut at the September meeting.

## The market reads the oil price and does not like it

The S&P/ASX 200 closed at 8,741.21 on 11 September 2026, down 0.89% for the session.\[1\] That puts the index at its lowest point since June, and the driver is not hard to find. Brent crude sat at US$109.51 a barrel on 9 September, closing in on US$110 for the first time in months.\[2\] Oil at that level moves directly into petrol prices, freight costs and, through those, into almost everything else.

## The inflation picture the RBA will have to work with

Australian CPI rose 3.5% in the 12 months to July 2026, sitting above the RBA's 2 to 3% target band.\[3\] Two cost categories are doing most of the work, and neither is responding to the cash rate in any obvious way.

ABS head of price statistics Rachael McCririck said housing rose by 5.0 per cent in the 12 months to July, with new dwellings up 5.7% as builders passed on higher costs for materials and labour.\[3\] Those are supply-side pressures. A rate hold does not fix a shortage of tradies or timber.

Fuel told the same story. McCririck said automotive fuel prices rose 7.5 per cent in July after falling for three months in a row, driven by higher world oil prices and the partial unwinding of the federal government's fuel excise relief measures.\[3\] With Brent now back near US$110, July's jump looks less like a one-off and more like the start of a new leg up.

## The RBA's timing problem

The RBA meets on 29 September. The next CPI release is scheduled for 30 September 2026, one day after the board sits down.\[4\] The board will set the cash rate without seeing the freshest read on the economy it is trying to cool, which is uncomfortable when oil is accelerating and the last CPI print was already above target.

Markets have drawn their own conclusion. ASX 30-day interbank cash rate futures settled on 18 August 2026 at 95.650, implying an average cash rate of 4.35%.\[5\] No cut is priced, so any business finalising a fourth-quarter budget is essentially working with 4.35% as the floor.

The RBA's September meeting falls on 29 September 2026, with the ABS CPI release following on 30 September.

This article contains analysis and commentary on market conditions. It does not constitute financial, investment, or professional advice. Past performance is not indicative of future results. Always consult a qualified adviser before making financial decisions.

SOURCES & CITATIONS

1. [S&P/ASX 200 index data, S&P Global](https://www.spglobal.com/spdji/en/indices/equity/sp-asx-200/?ref=promptthemarket.com)
2. [Brent crude oil price, FRED Federal Reserve Bank of St. Louis](https://fred.stlouisfed.org/series/DCOILBRENTEU?ref=promptthemarket.com)
3. [CPI rose 3.5% in the year to July 2026, ABS media release](https://www.abs.gov.au/media-centre/media-releases/cpi-rose-35-year-july-2026?ref=promptthemarket.com)
4. [Consumer Price Index Australia, July 2026, ABS statistics](https://www.abs.gov.au/statistics/economy/price-indexes-and-inflation/consumer-price-index-australia/jul-2026?ref=promptthemarket.com)
5. [ASX 30 Day Interbank Cash Rate Futures end-of-day summary, 18 August 2026](https://www.asx.com.au/data/futures/reports/EODWebMarketSummary260818SFD.htm?ref=promptthemarket.com)

FREQUENTLY ASKED QUESTIONS

Why did the ASX 200 fall on 11 September 2026?

The index dropped 0.89% to close at 8,741.21, its lowest level since June. The primary driver was Brent crude oil near US$110 a barrel, which renewed concerns that inflation would stay above the RBA's 2 to 3% target band for longer.

What is Australian inflation running at right now?

The Consumer Price Index rose 3.5% in the 12 months to July 2026, according to the ABS. Housing costs rose 5.0% over the same period and automotive fuel jumped 7.5% in July alone.

When does the RBA next meet, and what are markets expecting?

The RBA meets on 29 September 2026\. ASX futures settled on 18 August implied a cash rate of 4.35%, meaning markets are not pricing a cut at that meeting.

Why is the timing of the September CPI release significant?

The ABS will publish its next CPI reading on 30 September 2026, one day after the RBA meets. The board will make its rate decision without access to that data.

![James Dore](https://storage.ghost.io/c/e4/01/e4017178-c1da-4131-80aa-35f02cb5b999/content/images/2026/09/james-dore.jpg)

[James Dore](https://www.promptthemarket.com/james-dore/)

James Dore is founder and editor of Prompt the Market and Strategy Director at Bushnote, a Sydney strategy, SEO and AI search agency. He has a background in strategy, media and financial services, and led consumer product marketing at MONEYME. He writes on AI search, answer engines, technology policy and media economics.

Important

This is general financial information only and does not constitute financial advice. It has not been prepared taking into account your objectives, financial situation or needs. Before making any financial decision, you should assess whether the information is appropriate for you and consider seeking advice from a licensed financial adviser.