Met Office predicts 89% of underboob sweat in Wales next week
Women and overweight men have been warned to expect sweaty mammaries
Forecasters at the Met Office have issued an unprecedented amber warning after new modelling revealed that underboob sweat levels across Wales are expected to reach a staggering 89% next week, the highest reading since records began in 2019.
The forecast, presented at a hastily arranged press conference in Cardiff Bay, shows a band of “intense humidity and questionable bra support” sweeping in from the Bristol Channel on Monday, with conditions deteriorating sharply by Wednesday afternoon.
“We’ve never seen anything like this,” said senior meteorologist Gwyneth Pryce, gesturing at a weather map dotted with small damp cloud icons hovering just below chest height. “Normally we talk about rainfall in millimetres. This week, for the first time, we’re talking about it in bra cups.”
The Met Office’s new Underboob Index, developed in partnership with sportswear manufacturers and “several very sweaty volunteers from Merthyr Tydfil,” combines temperature, humidity, and synthetic fibre content to predict where moisture is most likely to gather beneath the bust.
“Tuesday is looking particularly grim,” Pryce continued. “We’re expecting a ridge of high pressure to sit directly over Swansea, trapping warm air against people’s torsos for up to six hours at a time. If you’re wearing anything underwired, my advice is: brace yourself, and maybe bring a flannel.”
Reaction across Wales has been mixed. In Newport, 34-year-old teaching assistant Carys Bevan said she had already adjusted her plans. “I was going to wear my good top to my sister’s barbecue, but not with an 89% chance of swamp conditions under there. I’ve laid out three spares.”
Others were less convinced of the science. “It’s a Tuesday in Wales,” said retired postman Gareth Hopkins from Bridgend. “It’s always 89% something under there. Sweat, rain, regret. Doesn’t need a forecast, just needs a mirror.”
Local gyms have reportedly seen a spike in bookings for “breathable fabric only” classes, while at least one Cardiff department store has moved its moisture-wicking vest range to the front window under a sign reading “BE PREPARED!”
The Met Office stressed that the 89% figure refers specifically to “localised underboob accumulation” and should not be confused with the separate, slightly more modest 67% armpit outlook also released this week, which forecasters described as “a much calmer situation, weather-wise.”
Asked whether the unusual focus on underboob conditions might set a precedent for future bulletins, Pryce was non-committal. “Look, people want to know what to expect when they get dressed in the morning. If that means we occasionally have to say the word ‘underboob’ on the Six O’Clock News, then so be it. We’re a public service. We go where the sweat takes us.”
The warning remains in place until Friday, when forecasters say conditions are expected to “dry up considerably,” though they have declined to rule out a “damp Saturday resurgence.”
Overweight men have also been warned.





