When it’s 25 degrees or hotter boys can wear PE shorts in school

School uniform policy is a matter for schools themselves. The Government sets guidance on school uniform policy. This recommends that schools "take a sensible approach to allow for exceptions to be made during extreme weather – for example, allowing pupils to wear shorts in very hot weather or allowing trousers to be worn instead of skirts in very cold weather." You can read more about this here: https://www.gov.uk/government/publications/school-uniform/school-uniforms You could reach out to a particular school to request they change their policy.