The UK Health Security Agency (UKHSA) confirmed the alert will be in force from 9am on Wednesday, July 29 until 9am on Thursday, July 30. Forecasters say temperatures in Basingstoke will rise sharply through Wednesday, peaking at around 32°C in the late afternoon. By Thursday morning, temperatures are expected to rise again, reaching around 20°C by 9am as the alert period comes to an end. The warning highlights an increased risk to health as temperatures rise, particularly for vulnerable groups. UKHSA said heat can affect the body’s ability to regulate temperature, with sweating becoming the primary way to cool down when outdoor temperatures exceed skin temperature.