Parts of the UK are bracing for an unusually warm day today, with temperatures in London and East Anglia potentially reaching 27°C, surpassing the expected 26°C in Honolulu, Hawaii. According to the Met Office, this would mark the hottest day of the year so far. Meteorologist Simon Partridge noted that warm, humid air is moving up from the south, particularly benefiting the eastern and southeastern regions of the UK. However, the weather is expected to be unsettled, with significant cloud cover and the possibility of heavy rain and thunderstorms, especially in the Midlands. Cardiff is forecasted to outpace Athens today, where temperatures are predicted to peak at only 14°C. Despite today's warmth, the upcoming May Day bank holiday weekend is set to bring a shift in weather, with rain expected nationwide and temperatures returning to typical April levels of 11-16°C by Monday.