The UK is set to transition from cool and unsettled weather to warmer conditions as the May Bank Holiday approaches. According to the Met Office, temperatures will start to rise from May 20, with the South and East of England experiencing the most significant improvements. By Friday, May 22, many areas will feel more like early summer, with temperatures reaching up to 26°C in southern regions. However, forecasters caution that this warm weather will come with instability, leading to the possibility of heavy and thundery showers, particularly on Saturday. Met Office deputy chief forecaster Tony Wisson noted that while the warmth will persist through the weekend, conditions will become more unsettled, with a mix of cloud and rain expected. Fortunately, Sunday, May 24 is predicted to bring high pressure, which will reduce rainfall chances and allow for continued warm temperatures. Overall, the outlook for the Bank Holiday weekend suggests warm and fine weather for most, although some areas may still experience occasional showers.