Amber heat-health alerts issued for most of England as the fifth heatwave beginsHigh pressure builds across the UK and is forecast to dominate the weather this week, bringing plenty of sunshine in the south. Under the scorching summer sunshine, temperatures across the country, especially in the south, will climb into the mid-thirties this week. Temperatures in the 30s can be expected across the south, prompting heat-health alerts for the south and central England. Daytime highs of 30-32 °C can be expected through the south and central England on Wednesday. Met Office warns of extreme heat in the south from Wednesday, and hence, a potential heatwave is highly likely for the southeast and south England on Thursday.