J-League heat‑safety and schedule reforms

In late July 2026 the Japanese professional football league announced new heat‑safety rules for the upcoming 2026‑27 season. A mandatory "drinking‑water time" will be enforced during the core summer period, and cooling breaks of one to three minutes will be introduced based on the WBGT heat‑stress index.

A few weeks later, in early August 2026, the league expanded its reforms by moving the season start from February to August, adopting an autumn‑spring calendar. The shift is intended to minimise exposure to extreme summer heat, improve player performance and align the transfer window with European clubs. Alongside the schedule change, the league also introduced updated refereeing standards modeled on recent World Cup practices.

Together, these measures reflect a broader effort by the J‑League to protect player health, adapt to Japan’s rising summer temperatures, and modernise competition rules.