Probable forecastOpen
The U.S.-Iran Pause: Will the Hormuz Strait Reopen by August 31?
A fragile pause in U.S.-Iran strikes has markets cautiously optimistic, but the path to restored Hormuz traffic by month's end remains narrow.
Probable’s read
Medium confidence. Based on prediction-market pricing.
Market cross-check: 17% — Probable's read differs by 3 points, for the reasons below.
Polymarket traders priced Hormuz normalization by August 31 at 14%, with $439,000 in 24-hour volume — a reasonably liquid signal. The news inputs show a pause in U.S. strikes and signals of possible diplomacy, but also ongoing mine strikes on tankers, Houthi attacks on Saudi Arabia, and Iran's foreign minister vowing retaliation over a separate vessel incident. Nothing in the reporting suggests the physical security conditions in the strait are anywhere near resolved within five weeks, so we stay close to the market.
What’s likely. The Wall Street Journal reported that Trump paused Iran strikes as officials weighed dwindling air defense stocks, and CNN confirmed the administration signaled the pause would allow talks to progress. Oil prices fell sharply on the news, per CNBC. But the New York Post reported a tanker hitting a mine in the strait and Iran intercepting six vessels, and AP News reported Houthi missiles fired at Saudi Arabia. Even with a diplomatic pause, the physical risk to Hormuz shipping has not been neutralized, and five weeks is a short window for a waterway in an active conflict zone to return to anything resembling normal operations.
The evidence
Prediction markets
Polymarket traders priced Strait of Hormuz traffic returning to normal by August 31 at 14%, with approximately $439,000 in 24-hour volume.
14%Source: Polymarket
A separate Polymarket market on whether the Israel-Iran ceasefire continues through July 31 sits at 88%, suggesting traders see the current pause as likely to hold in the very near term even if longer normalization remains doubtful.
88%Source: Polymarket
The synthesis
How Probable got to 14 percent
Polymarket's 14 percent on Hormuz normalization by August 31 is the anchor here, and the news inputs give us no reason to depart from it. The diplomatic pause is real — the WSJ and CNN both report it — but the Economist noted that the U.S. has few good options for decisive military action, and the Times of Israel reported Iran's foreign minister vowing retaliation over a separate vessel incident. A ceasefire holding short-term (88 percent by July 31, per the separate Polymarket market) and Hormuz returning to normal commercial operations are two very different things, and the mine strike and vessel intercept reported by the New York Post make the latter look distant. We stay at 14 percent.
Why it matters to you
The Strait of Hormuz is a critical chokepoint for global oil supply, and CNBC reported oil prices sliding 5 percent on the pause news alone — which illustrates how sensitive energy markets are to even marginal changes in the conflict's temperature.
What to watch
Whether formal ceasefire or de-escalation talks produce a written framework in the next two weeks — without that, the physical mine and intercept threat in the strait is unlikely to clear before August 31.
Further reading
- WSJ — “Trump Pauses Iran Strikes as Officials Weigh Dwindling Air Defense Stocks”
- CNN — “Trump administration signals that pause in Iran strikes will allow talks to progress”
- CNBC — “Oil slides 5% as Iran reportedly signals halt to attacks if U.S. pause holds”
- New York Post — “Tanker hits mine in the Strait of Hormuz as Iran intercepts six vessels”
- AP News — “Iran-backed Houthis fire missiles at Saudi Arabia in response to airstrikes in Yemen”
- The Economist — “America has few good options for a 'massive attack' on Iran”
- The Times of Israel — “Iran's FM claims Ukraine struck Iranian vessel 'at Israel's behest,' vows retaliation”
The question we’re forecasting
Will Strait of Hormuz shipping traffic return to normal by August 31, 2026?
Resolves by August 31, 2026 — then we grade it yes/no on the scoreboard.
From the briefing
This forecast was published in Probable’s briefing on Monday, July 27, 2026: Monday on Probable — A mass shooting at Seattle Center, a U.S.-Iran pause, and the Fed's decision two days out.
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Probable’s forecasts synthesize prediction markets, professional analysts, public opinion, and official data. Drafted with AI from cited sources. Reviewed before publishing. Not financial advice. Methodology · Spot an error?