Why the Rand weakened against the Dollar in September

One fascinating thing about currency markets is that a country can do almost everything right and still see its currency weaken.

September was one of those months.

If you looked only at South Africa, the story was not particularly alarming. Inflation remained reasonably contained, the Rand was not in freefall, and the South African Reserve Bank continued to demonstrate the sort of inflation-fighting credibility that investors generally like to see. Yet by month-end, the Rand had weakened noticeably against both the US Dollar and British Pound.

The reason lies thousands of kilometres away from South Africa.

In September, global events mattered more than local ones.

Why a stronger Dollar put pressure on the Rand

For most of 2026, markets had been debating whether the US Federal Reserve would need to raise interest rates again. The answer was finally delivered in September, and it was a clear one.

Early in the month, the US released its Non-Farm Payrolls data, one of the most closely watched economic indicators in the world. Economists were expecting around 55,000 new jobs. The actual figure came in at 162,000.

That might sound like a rather dull statistical release, but in financial markets it landed with all the subtlety of a rugby prop running at full speed.

Immediately, investors began pricing in a higher probability that the Fed would raise interest rates. Higher US interest rates generally mean higher returns for investors holding Dollars, and that tends to increase demand for the world's reserve currency.

A couple of weeks later, the Fed did exactly that, delivering a 25 basis point rate increase, its first hike since 2023.

The consequence was predictable. The Dollar strengthened, US bond yields surged, and emerging market currencies, including the Rand, came under pressure.

For South Africans, there is an important lesson here.

The Rand is not simply a reflection of South Africa. It also reflects what is happening everywhere else. Sometimes the Rand weakens because South Africa has a problem. Sometimes the Rand weakens because America is doing exceptionally well. September was largely the latter.

Why investors preferred the Dollar over riskier assets

One theme that emerged repeatedly during the month was the relentless march higher in US Treasury yields.

The benchmark US 10-year Treasury yield climbed to levels not seen since before the Global Financial Crisis. Investors effectively looked at the US and said, "If we can earn more money holding US government debt, why take additional risk elsewhere?"

That's not great news for emerging markets.

When global money has attractive opportunities in the US, some of that capital inevitably leaves countries like South Africa. It doesn't mean investors suddenly dislike South Africa. It simply means they have alternatives.

Think of it as the world's largest savings account suddenly increasing its interest rate.

Naturally, people pay attention.

Middle East tensions added fresh pressure to global markets

As if higher interest rates were not enough, financial markets also had to contend with a renewed wave of geopolitical uncertainty.

The Middle East once again dominated headlines.

Concerns around the Strait of Hormuz, ongoing tensions involving Iran, disruptions to shipping routes, and broader instability across the region pushed oil prices sharply higher during the month.

For South Africa, this matters more than many people realise.

We import most of our oil. Every increase in the oil price eventually finds its way into fuel prices, transport costs and inflation. It acts like an invisible tax on the economy.

Higher oil prices also create headaches for central banks. Just when inflation appears to be under control, energy costs reintroduce uncertainty.

Markets dislike uncertainty almost as much as they dislike inflation.

September delivered both.

South Africa remained relatively stable despite global headwinds

Against this global backdrop, South Africa's domestic picture was surprisingly steady.

Inflation rose modestly to 4.4%, remaining relatively contained by international standards. Growth remained weak, with the economy having contracted by 0.2% during the second quarter, but there was little in the local data that suggested a sudden deterioration in South Africa's fundamentals.

The South African Reserve Bank nevertheless decided to act.

Concerned about rising oil prices, inflation risks and the possibility of global inflation becoming more entrenched, the SARB raised interest rates by 25 basis points, taking the repo rate to 7.25%.

Interestingly, the Rand weakened even after the hike.

At first glance, that seems strange. Higher interest rates are usually supportive of a currency.

But currencies are relative instruments.

Imagine two athletes running a race. One speeds up. That's good. But if the other speeds up even more, they still fall behind.

That is essentially what happened during September.

The SARB raised rates, but the Federal Reserve became even more influential. Investors focused on the stronger Dollar story rather than the stronger Rand story.

Why the Pound gained against the Rand

The Pound followed a slightly different path.

The UK's economic performance remained mixed, but interest rate expectations remained relatively elevated, and sterling continued to find support.

GBP/ZAR traded comfortably above 21.50 for much of the month, although much of the movement was driven by Rand weakness rather than exceptional strength in the Pound itself.

In many respects, the Pound simply benefited from the same broad theme that drove the Dollar higher: investors preferred developed market currencies while uncertainty remained elevated.

USD/ZAR breaks above a key technical level

From a market perspective, September was significant because USD/ZAR moved back above the psychologically important 16.00 level.

Technical traders pay close attention to these large round numbers because they often influence market behaviour.

Once the pair established itself above 16.00, momentum shifted. The market spent much of the month exploring higher trading ranges, with rallies toward the mid-16s becoming increasingly common.

While technical analysis never tells us why a currency moved, it often tells us how market participants are positioning themselves.

By month-end, the message from traders was fairly clear.

The burden of proof had shifted back to the Rand.

Three key factors that could move the Rand in October

As we move into October, three themes remain dominant.

The first is the US economy. If US inflation remains sticky and employment continues to surprise to the upside, expectations for further Fed tightening could reinforce Dollar strength.

The second is geopolitics. Markets will continue monitoring developments in the Middle East and the impact on global energy markets.

The third is South African inflation. The SARB has shown it is willing to act when necessary, but much will depend on whether higher oil prices begin feeding through into domestic inflation measures.

For now, the Rand finds itself in a familiar position.

Domestic conditions are not disastrous. Interest rates remain attractive. Inflation remains broadly under control.

The challenge is that the rest of the world has become more complicated.

And in foreign exchange markets, sometimes that is all it takes.

October has already raised the stakes

And if September felt busy, October has certainly not waited around to catch its breath.

October has already got off to a volatile start, with the Rand weakening by more than 1.5% against major currencies in a single trading session. That is a significant move by any standard and an early reminder of just how quickly sentiment can shift in foreign exchange markets.

Whether this marks the start of a broader trend or simply a sharp market reaction remains to be seen. What it does tell us is that investors remain highly sensitive to developments around US interest rates, geopolitical tensions in the Middle East, commodity prices and global risk sentiment.

If September was the month where the foundations of a stronger Dollar story were laid, October may be the month where that story truly gets tested.

One thing seems certain: the month ahead is unlikely to be short of action.

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