Will the ceasefire between Iran and the United States continue to hold 7 days from today?

TL;DR

I forecast a 66.9% chance that the U.S.-Iran ceasefire will still be treated as in effect on June 12, 2026.

Context

The forecast date is June 5, 2026, so the resolution date is June 12, 2026. A ceasefire clearly existed: AP reported that the U.S. and Iran agreed on April 7 to a two-week ceasefire including reopening the Strait of Hormuz, and the White House said on April 8 that Iran had agreed to a ceasefire while broader peace talks continued (AP, Apr. 7; White House, Apr. 8).

As of late June 5, the ceasefire is nominal but still alive under the question’s reporting standard. CBS updated at 6:19 p.m. EDT on June 5 that the U.S. says it is still in a ceasefire with Iran despite clashes, while also reporting new Iranian drones toward the Strait of Hormuz, no ships hit, and U.S. forces shooting down at least four drones (CBS, Jun. 5).

Evidence

The outside-view base rate is not clean. The best broad ceasefire dataset is ETH/PRIO, which covers more than 2,200 civil-conflict ceasefires from 1989 to 2020, not interstate U.S.-Iran wars; it is useful mainly because it shows that many ceasefires are loose, temporary arrangements inside continuing conflict, rather than clean war endings (ETH Zurich CSS; PRIO). The more relevant base rate is this ceasefire’s own history: since April 7, repeated missile, drone, naval, and blockade incidents have not yet produced a consensus AP/Reuters/CBS finding that the ceasefire ended.

The maritime data match the news risk. IMF PortWatch’s chokepoint data show average Strait of Hormuz traffic of 95.9 vessels per day in 2023, 98.6 in 2024, 93.7 in 2025, and 36.3 in 2026 through May 31; the latest daily observation I checked was 10 vessels on May 31, far below the normal prewar range (IMF PortWatch). I use this as a contact-risk indicator, not as a direct resolution rule.

My model separates current-status risk from seven-day breakdown risk. I put a 96% chance on the ceasefire being recognized as still in effect at the forecast time. Conditional on that, I put the next-week YES probability near 70%. The main NO paths are a successful Iranian attack killing U.S. personnel, a U.S. decision to resume large-scale bombing after talks fail, or a Lebanon-triggered cascade that becomes direct U.S.-Iran hostilities. A scenario calculation gives 66.9%: 28% de-escalation or MOU progress with 94% YES, 42% managed limbo with further limited fire and 78% YES, 16% intensified but ambiguous flare-up with 45% YES, 10% clear breakdown with 4% YES, and 4% adjudication/current-status reclassification with 5% YES.

What's non-obvious

The obvious read is that a ceasefire with missiles, drones, and U.S. strikes has already failed. That is not how the relevant sources are treating it. Reuters reported on May 5 that more than 10 Iranian attacks on U.S. forces since April 7 were still below the threshold for restarting major combat operations, and CBS still said on June 5 that the U.S. says it is in a ceasefire with Iran despite recent missile attacks (Reuters via Investing.com, May 5; CBS, Jun. 5). For this resolution standard, the label matters.

The less obvious danger is Lebanon. Iran has tied a broader U.S. deal to Lebanon, Hezbollah rejected the latest arrangement, and Israeli strikes were still killing people in Lebanon on June 5 (AP, Jun. 5; CBS, Jun. 5). That does not itself resolve this U.S.-Iran question, but it is the most plausible indirect path to a formal collapse in the next week.

Limitations

The main uncertainty is definitional. The resolution criteria list airstrikes, missile strikes, and naval attacks as possible NO evidence, but also say isolated incidents do not count unless widely characterized as ending the ceasefire. The recent record already contains repeated direct attacks, so a stricter adjudication style would lower this forecast.

The second gap is source freshness and hidden activity. I found no major-source consensus by the forecast time saying the ceasefire had ended. But news can lag military reality, and a June 5-6 incident not yet confirmed could dominate the outcome.

The third gap is private decision-making. Trump’s red line around U.S. troop deaths is public, but Iran’s tolerance for the blockade and its linkage to Hezbollah are opaque. That makes the next seven days unusually sensitive to a single successful strike or a single official declaration.