LONDON (Reuters) -Climate change is narrowing the window for record-breaking performances at the world’s top marathons, according to new research released ahead of Sunday’s New York City Marathon.

Concerned elite athletes say rising temperatures are reshaping the sport with some city marathons more impacted than others. Berlin’s event last month was raced in unseasonal temperatures of 75 degrees Fahrenheit.

A report by U.S.-based non-profit Climate Central finds that 86% of 221 global marathons analysed on their 2025 dates are expected to see a decline in the odds of optimal running conditions by 2045, including all seven Abbott World Marathon Majors.

Mhairi Maclennan, the fastest British female finisher at the 2024 London Marathon, said the findings reflect a growing challenge for elit

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