Why heatwaves hit women harder

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Biologically, women’s greater risk comes down to two things: the natural rise and fall of our hormone levels and our body's response to heat, which are different to men's, Dr Arif said.

Women produce less sweat and start sweating at a higher temperature, research – including this 2025 study – shows.

This impairs our ability to quickly shed excess heat and makes it harder to judge when our bodies are under burden, simply because we can't see as much sweat on our skin or clothing.

The same research found that women also have a higher core body temperature and body fat percentage than men, which acts like an extra insulating layer.

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