The UK is bracing for a mini heatwave, with weather forecasts predicting temperatures to soar to 26°C starting on May 20. The latest data from WXCharts indicates that London and Cambridge will experience the highest temperatures, while the south coast could see highs of 23°C to 24°C. Other regions, including the Midlands and the East of England, are expected to enjoy temperatures around 20°C. However, forecasters from Metdesk caution that the warm spell may be short-lived, as the Met Office's long-range forecast suggests unsettled weather with potential rain and cooler temperatures could return. Scotland will likely remain the coolest part of the UK, with temperatures ranging from 13°C to 16°C. Overall, while the mini heatwave offers a brief respite from cooler conditions, the weather may remain unpredictable for much of May.