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

TL;DR

I estimate a 74% chance that the U.S.–Iran ceasefire will still be treated as in effect on June 19, 2026.

Context

The forecast date is June 12, 2026, so the resolution date is June 19, 2026. Major reporting still treats the April ceasefire as alive but badly damaged: AP wrote on June 12 that Pakistan said the U.S. and Iran had reached a “final, agreed upon text,” that Iran had exchanged fire with the U.S. and Israel over the prior three days, and that “a fragile ceasefire has been in place since April 7” (AP, June 12).

That status is not calm. AP reported on June 11 that two days of U.S.–Iran attacks had pushed the region closer to resumption of full-scale war, while Iran’s Foreign Ministry said U.S. attacks had rendered the ceasefire “meaningless,” without saying Iran was abandoning it (AP, June 11). The question is therefore less “will there be zero fire?” and more “will major sources switch from ‘strained ceasefire’ to ‘ceasefire ended’ by June 19?”

Evidence

The historical backbone says a live ceasefire usually survives a single week, even when violations occur. The ETH/PRIO Civil Conflict CeaseFire dataset covers 2,202 ceasefires in civil conflicts from 1989 to 2020 across 66 countries and 109 conflicts; using failed nationwide ceasefires, its median duration is 10 days at a one-fatality threshold, 65 days at a 25-fatality threshold, and 193 days at a 100-fatality threshold (Journal of Conflict Resolution, 2023). This question’s rule is closer to the higher thresholds than to a one-shot threshold, because isolated incidents do not count unless major reporting treats them as ending the ceasefire. A separate survival analysis of 231 written civil-war ceasefire agreements from 1990 to 2019 found that, 30 days after entry into effect at a 25-death threshold, 85% of weak cessation-of-hostilities agreements, 92% of preliminary ceasefires, and 96% of definitive ceasefires remained active (International Studies Quarterly, 2021). The current U.S.–Iran case is more dangerous than those base rates, but the base rate keeps the one-week prior above 50%.

The strongest YES evidence is the synchronized diplomatic signal. AP reported on June 12 that Pakistan’s prime minister said final wording had been agreed and that Iranian Foreign Minister Abbas Araghchi said an agreement had never been closer (AP, June 12). Axios reported on June 12 that the draft memorandum would extend the ceasefire for 60 days, reopen the Strait of Hormuz immediately, lift the U.S. blockade, and start nuclear talks; the same report said the deal still needed final sign-off, Iran had not reached a final decision, and the White House had wrongly thought a deal was close several times in the prior two months (Axios, June 12). Axios later quoted a senior U.S. official putting the signing chance in the “80–85%” range but “not 100%,” and said Iran’s internal consultations were still in their final stages (Axios, June 12). I discount that official’s number because it is a party to the talks, but the convergence of mediator, U.S., and Iranian signals is real evidence.

The strongest NO evidence is that the ceasefire has already absorbed events that look like active hostilities in ordinary language. AP reported that on June 5 the U.S. shot down Iranian missiles and drones aimed at Gulf allies and the Strait of Hormuz and struck Iranian coastal radar sites, calling it an exchange that “further frayed” the ceasefire (AP, June 5). AP reported on June 6 that Iran fired ballistic missiles and drones toward Bahrain and Kuwait, while Tehran said it was targeting U.S. military assets after U.S. attacks on Iranian facilities (AP, June 6). AP then reported on June 11 that the U.S. had launched a second round of airstrikes into Thursday morning, that Bahrain, Kuwait, and Jordan had come under Iranian fire, and that the back-and-forth attacks had pushed the region closer to full-scale war (AP, June 11). That is why I do not treat the deal reports as enough for an 80%+ forecast.

The maritime data explain why both sides have an incentive to preserve the ceasefire label. IMF PortWatch daily chokepoint data for the Strait of Hormuz, pulled June 12 with last observation June 7, contain 1,000 daily observations from September 12, 2023 through June 7, 2026; units are vessel transits per day and cargo capacity in metric tons per day (IMF PortWatch).

June seasonality makes the disruption clearer: June 2024 averaged 104.9 vessels/day over 30 observations, June 2025 averaged 105.9 over 30 observations, and June 1–7, 2026 averaged only 5.1 over seven observations (IMF PortWatch). That raises clash risk around Hormuz, but it also gives Washington and Tehran a concrete reason to sign even a thin interim document. AP also reported that reopening Hormuz is a key problem in the emerging deal and that Iran still has missile and drone capacity despite U.S. claims of degradation (AP, June 12).

My numerical model has three parts. I put a 93% chance on resolvers treating a ceasefire as still in effect on June 12, because AP, Reuters-linked coverage, Axios, and officials still describe an April ceasefire that can be extended, but I reserve 7% for the chance that the June 10–11 strike cycle is later judged to have already crossed the resolution threshold. Conditional on a live ceasefire, I put a 62% chance on a signed or effectively announced MOU/extension by June 19. If that happens, I give the ceasefire a 92% chance of still being treated as in effect on June 19. If no MOU is signed or clearly locked by then, I give it a 60% chance, because the old ceasefire label is sticky but the post-failed-deal escalation risk is high.

$$P(\text{YES}) = 0.93 \times [(0.62 \times 0.92) + (0.38 \times 0.60)] = 0.742512$$

What's non-obvious

The ceasefire has become a political and media category, not a literal no-fire condition. Direct U.S.–Iran fire has already occurred, yet AP and Reuters-linked reporting still describe the April ceasefire as frayed, strained, or extendable rather than over (AP, June 11; Reuters via Investing.com, June 12). That makes YES more likely than a literal reading of “airstrikes occurred” would imply.

The deal also does not have to solve the nuclear dispute to resolve this question YES. Axios says the draft MOU would extend the ceasefire for 60 days while punting the hard nuclear details to follow-on talks (Axios, June 12). The main spoiler is not technical nuclear language this week; it is another direct U.S.–Iran strike cycle, or an Israel-Lebanon escalation that pulls the U.S. and Iran back into sustained direct fire. Axios reported on June 12 that Netanyahu had considered large strikes before Trump stopped him, and that some in Washington see him as a possible spoiler even if the deal takes hold (Axios, June 12).

Limitations

The biggest limitation is definitional. The June 10–11 events sit close to the line between “isolated incidents inside a ceasefire” and “renewed active hostilities.” If the resolver treats any new direct U.S. or Iranian airstrike after June 12 as automatically ending the ceasefire, my probability would be closer to the mid-60s. If the resolver follows the current major-source language and requires consensus that the ceasefire has ended, it would be closer to 80%.

I could not verify a public full text of either the April ceasefire or the June draft MOU. Current deal reporting rests on officials, mediators, and partial descriptions; Iran had not made a final public decision as of the latest reports I found on June 12 (Axios, June 12). PortWatch data are also lagged, with the latest observation on June 7 in a June 12 pull, so they show the severity of the maritime disruption but not real-time conditions at the forecast hour (IMF PortWatch).