Brits are set to bake by the end of the week as the UK Health Security Agency issues heat alerts and the Met Office predicts heatwave conditions for swathes of the country12:34, 17 Jun 2026Updated 12:41, 17 Jun 2026The Met Office has issued a warning for heatwave conditions this weekend and beyond as temperatures soar with one forecaster predicting a scorching 37C by Monday.‌Met Office experts said temperatures are expected to reach the high 20s Celsius widely with the potential for 32C to be reached in the south of England on Sunday and then "even higher temperatures".‌New weather charts from Netweather show southern and eastern England is due to be baked by intense heat with the forecaster predicting highs of 37C in Greater London on Monday.‌A Met Office statement said: "Some areas in the south and southeast of England are likely to see heatwave criteria met by Saturday and more widely on Sunday, with the potential for temperatures to reach the low 30s in the warmest locations."Headline maximum temperatures for the period are: 32C on Friday in East Anglia, 28C on Saturday as the warmest air temporarily shifts away from the UK, 32C in the south and southeast of England on Sunday and the potential for 33C in the same areas on Monday as warm conditions build again from the south."In the UK, a heatwave is officially defined as a location recording at least three consecutive days with daily maximum temperatures meeting or exceeding the heatwave temperature threshold, the Met Office said. This threshold varies by county.‌The UK Health Security Agency (UKHSA) has issued yellow heat-health alerts for parts of England. The warnings cover four regions, the South East, London, the East of England and the East Midlands, between June 17 and June 22, .The agency warned that high temperatures in the coming days could see greater risk to life of vulnerable people and increased use of healthcare services by vulnerable people. There could also be a spike in water‑related incidents, including risks from cold‑water shock and drowning, the government body said.‌During the previous record-breaking heatwave, from May 24 to 31, the UK saw a horrifying death toll of 19 children and adults killed in water related incidents during one week. In response the Mirror launched our 'Save Lives for Sam' campaign to stop the "catastrophic" deaths of 33 children who drown in England every year - "the equivalent of a classroom of children lost".Bereaved families, Olympic legends and safety organisations have joined together to call on the Government to take five key steps to save young lives across the country.Deputy Chief Forecaster, Gregory Wolverson, said: "This week's weather reflects a contrast we often see in summer, with more unsettled conditions passing to the northwest of the UK while heat builds in the south and east. As we move towards the weekend, we’ll see conditions become more widely settled and temperatures rise all round. Many parts of southern and eastern England are likely to see temperatures high enough to meet heatwave thresholds.‌"It's important to note that while temperatures may be high, we might not all see the wall-to-wall sunshine and blue skies we experienced back in May because there is more cloud around. There is also a chance of thunderstorms developing in places, particularly later each day, which could bring heavy showers and localised impacts."Counties forecast to top 30C on MondayBerkshireBristol‌BuckinghamshireCambridgeshireDorset‌SussexEssexGloucestershire‌Greater LondonHampshireHertfordshire‌KentNorfolkNorthamptonshire‌OxfordshireSomersetSuffolk‌SurreyWarwickshireWiltshireArticle continues belowWorcestershire