The UK is experiencing a mini September heatwave, with temperatures reaching 26C in London and 25.5C in Inverness, significantly above the seasonal average. This warm weather is described as 'summer's last hurrah' by Met Office meteorologist Dan Stroud, who warns of impending changes as low pressure systems move in, bringing thundery showers and heavy rainfall over the weekend. Glasgow is expected to see a high of 18C but will soon face a drop to 13C and rain, while central and southern England brace for downpours, with flood warnings already issued for certain coastal areas. The warm temperatures are a stark contrast to last week's frost, highlighting the rapid shift in weather patterns. As autumn approaches, the Met Office anticipates a return to normal seasonal conditions and successive bands of rain in the following week.