The Met Office heatwave warning comes into force as parts of England and Wales are expected to experience sustained high temperatures. Multiple reports say daytime conditions could reach record levels, with some areas forecast to hit at least 38C. Overnight temperatures are also expected to remain unusually high, with some conditions described as “sweaty,” including temperatures that are expected to feel close to 30C by around 5am. Alongside the temperature forecasts, the Met Office and other outlets highlight concerns about “heat stress.” The warnings indicate that the main risk is from prolonged exposure to hot weather, especially for vulnerable groups, even during nighttime. Across the covered regions, the forecast focuses on both the day’s peak heat and the lack of overnight cooling, which can increase discomfort and potential health impacts. The current update reflects an expectation of continued hot conditions over several days rather than a single-day spell, with authorities advising attention to heat-related risk during both daytime and evening hours.