Many of London’s beautiful old West End theatres were built long before modern air conditioning, so summer performances can feel quite warm, especially if you’re seated in the stalls where heat rises and the crowd is packed in. I usually recommend light, breathable clothing maybe a summer dress, linen shirt, or short sleeves make a huge difference in comfort.
Some venues like the National Theatre or newer West End refurbishments do have better ventilation, but classics like the Lyceum, Her Majesty’s, and Prince Edward can get stuffy