US Mortgage Rates Hit One-Month Low at 6.56% as Iran Deal Pulls Down Treasury Yields

US mortgage rates fell to a one-month low in the wake of the US-Iran peace framework, offering the housing market a modest reprieve heading into the second half of 2026. According to Mortgage News Daily's index, the average 30-year fixed mortgage rate dropped to 6.56% — down 0.02 percentage point on the day and matching the most recent low set on May 29. Zillow data provided to U.S. News put the average 30-year purchase rate at 6.6% on June 15, with the 30-year refinance rate at 6.702% and the 15-year rate at 5.726%.

The decline was driven directly by the market reaction to the US-Iran agreement announced June 14. An Iran deal reduces the upside risk to oil prices, which in turn eases inflation expectations and pulls down the 10-year Treasury yield — the benchmark most closely tied to mortgage pricing. Reuters reported US crude futures settled 4.9% lower following the deal news. Gene Goldman, chief investment officer at Cetera Investment Management, summarised the mechanism: 'We have a US-Iran deal that's driving oil sharply lower.' Lower oil prices reduce inflation pressure, which feeds into Treasury yields and mortgage pricing.

Despite the improvement, experts cautioned that mortgage rates are unlikely to fall sharply in the near term. Mortgage rates had risen since the US war in Iran began at the end of February, climbing from below 6% in early 2026 to the mid-6% range as oil-driven inflation pushed Treasury yields higher. Matthew Graham of Mortgage News Daily noted rates are 'in solid shape in the context of the last month' but remain in an elevated range.

Crucially, the Mortgage Bankers Association continues to anticipate that the Federal Reserve's next move will be a rate hike rather than a cut — a view that keeps a floor under mortgage rates. Bob Broeksmit, MBA president and CEO, said: 'MBA continues to anticipate that the Fed's next move will be a rate hike, and that means mortgage rates are unlikely to drop anytime soon.' Most experts expect 30-year fixed rates to remain above 6% over the next few years, with the National Association of Home Builders forecasting an average of 6.18% in 2026 and a dip below 6% only in 2027–2028.

The housing market, which had been expected to rebound in 2026, has instead been sidelined by the elevated rate environment, with many prospective buyers waiting on the sidelines. A sustained US-Iran de-escalation that brings energy prices down meaningfully could open room for rates to move lower — but only if inflation convincingly retreats toward the Fed's 2% target.