UK weather: Temperatures to hit 35°C today before temperatures tumble across the UKThe UK's latest heatwave will reach its peak today, with temperatures soaring to 35°C across southeast England. The hottest day of the week has arrived, with temperatures expected to climb to 35°C across parts of southeast England as the latest heatwave reaches its peak. The strongest sunshine is expected across southeast England, where temperatures could reach 35°C, while many other parts of England are likely to exceed 30°C. Wales will also enjoy another very warm day, although temperatures will be slightly lower than those across southeast England. The strongest sunshine is expected across southeast England, where temperatures could reach 35°C.