If you traded the dollar during the week of June 15, you saw the market change direction fast.

The week started with relief over an interim agreement between the United States and Iran. Oil prices fell, market fear eased, and demand for the U.S. dollar weakened.

Then the Federal Reserve changed the mood.

The Fed kept interest rates unchanged, but its message suggested another increase was still possible. The dollar recovered, U.S. bond yields climbed, and major pairs quickly gave back some of their earlier moves.

Here is what moved the market and what traders may face next.

The Iran Agreement Weakened the Dollar

The first major move came from outside the economic calendar.

The United States and Iran reached an interim agreement that included plans to reopen the Strait of Hormuz. This is one of the world’s most important oil shipping routes.

The news pushed oil prices lower and made markets feel less defensive. As fear eased, traders had less reason to hold the dollar as a safe haven currency.

The dollar index fell 0.20% to 99.60, its lowest level in ten days. The euro climbed to $1.1597, while the British pound reached $1.342.

For traders watching EUR/USD and GBP/USD, the story looked simple: lower geopolitical risk meant a weaker dollar and stronger risk sentiment.

But the move did not last.

The Fed Brought Dollar Buyers Back

The Federal Reserve kept rates between 3.50% and 3.75% on June 17. That was expected.

What traders did not fully expect was the stronger message behind the decision.

Nine Fed officials projected at least one rate increase before the end of 2026. The central bank also raised its inflation outlook.

Markets reacted quickly. The dollar index climbed 0.50% to 100.01. The euro and pound each fell around 0.50% against the dollar.

Traders who focused only on the unchanged rate may have missed the real signal. The market was reacting to what the Fed might do next.

U.S. Treasury yields also moved higher. Higher yields can support the dollar because they may make U.S. assets more attractive to global investors.

The Fed did not raise rates, but it gave traders a reason to reconsider expectations for the dollar.

Japan Raised Rates, but the Yen Still Struggled

The Bank of Japan raised its policy rate from 0.75% to 1.00%, its highest level in more than three decades.

A rate increase would normally support the yen. However, USD/JPY remained near 160.

Why?

Even after Japan’s increase, U.S. interest rates were still much higher. That gap continued to make the dollar more attractive to some investors.

Japan is also a major energy importer. Higher oil prices can increase its import costs and place more pressure on the yen.

This created a frustrating setup for yen traders. The Bank of Japan delivered a historic rate increase, but the currency still had to compete with higher U.S. yields, energy risks, and concerns about possible intervention.

Other Central Banks Kept Traders Waiting

The Bank of England kept its rate at 3.75%, although two officials voted for an increase. That split showed that inflation remained a concern and gave pound traders another reason to watch future policy signals.

Sterling also faced political uncertainty after Prime Minister Keir Starmer announced his resignation on June 22. This left GBP/USD caught between UK politics, Bank of England expectations, and broader dollar strength.

The central banks of Switzerland, Norway, and Australia also held rates steady. However, their messages showed that further increases remained possible if inflation stayed high.

The common message was clear: central banks were not ready to relax yet.

What May Affect Forex Traders This Week

Attention now shifts to whether the latest economic data supports the Fed’s inflation concerns.

The most important U.S. release is PCE inflation, the Fed’s preferred measure of consumer price changes. A stronger result could keep another rate increase in the conversation. A softer reading could reduce some of those expectations.

U.S. Gross Domestic Product, or GDP, is also in focus. It measures the size and growth of the economy. Flash PMI reports will offer an early look at business activity in the United States, Europe, and the United Kingdom.

These releases could create movement across EUR/USD, GBP/USD, and USD/JPY.

Canadian inflation may also affect USD/CAD by changing expectations for Bank of Canada policy.

Beyond the calendar, traders may continue watching oil and the Strait of Hormuz. Any setback in the U.S. and Iran agreement could raise energy prices, revive inflation fears, and increase demand for safe haven currencies.

The Bottom Line

Last week showed how quickly a forex theme can reverse.

The Iran agreement weakened the dollar at first. The Fed’s stronger inflation message then brought dollar buyers back.

This week, traders may look for evidence that supports or challenges the Fed’s position. U.S. inflation remains central to the dollar, UK politics may add volatility to the pound, and the rate gap between the United States and Japan may continue to shape USD/JPY.

Oil connects all these stories. It affects inflation, central bank expectations, and currencies.

For traders, the next major move may not come from one headline alone. It may come from how economic data, interest rates, and geopolitical developments interact.