<p>This article develops the concept of temporal instability as an analytical framework for understanding environmental violence in the 2026 US–Iran war. Drawing on blue humanities scholarship that positions water as a material, cultural, and political participant in human affairs, the article argues that contemporary warfare wages violence through spatial destruction and through the deliberate disruption of hydrological rhythms: seasonal rains weaponized, marine ecologies arrested, and aquifers poisoned across generational timescales. Reading testimonial accounts, the historical echo of Iran–Iraq War chemical weapons victims, and the more-than-human witness of environmental data together, the article contends that the war’s violence cannot be contained within conventional temporal or spatial boundaries. The study concludes by proposing hydro-temporal justice as an ethical framework for reckoning with violence distributed across generations, and by situating this framework in dialogue with emerging legal instruments including ecocide law and constitutional rights of nature provisions.</p>