In the Naruto Shippuden anime canon, More specifically, his death occurs in March , based on the official timeline established by the Naruto databooks and the events surrounding the Fifth Hokage’s summit.

Rest in peace, Itachi Uchiha. You deserved a full spring.

The season in which Itachi dies, Season 4 of "Naruto Shippuden," showcases not only his final moments but also delves into his past, providing insights into the motivations behind his actions. This season is crucial as it covers the lead-up to and the immediate aftermath of his death, affecting characters' developments and the overall plot.

Let’s break down the canonical timeline, the in-universe weather, and the real-world broadcast details to give you a definitive answer.