Advanced weather models indicate a significant rise in temperatures across the UK, with forecasts suggesting highs of 25°C in London and 24°C along the south coast on May 20. The ECMWF weather model predicts that 34 counties could see temperatures of 20°C or more on May 19 and 20, particularly in southern and eastern England. Areas such as Yorkshire, Lancashire, and parts of South Wales may also experience warmer conditions. However, temperatures in Scotland and Northern Ireland are expected to remain cooler. According to the Met Office, while the middle of May may bring unsettled weather with periods of rain, temperatures are likely to improve towards the end of the month, possibly exceeding seasonal averages. The forecast emphasizes that while initial conditions may be changeable, a trend toward warmer weather is anticipated as May progresses.