The UK is bracing for an Arctic blast that will significantly drop temperatures to as low as 0°C in some areas by mid-September, following a period of balmy weather. Weather forecasts predict a storm hitting the UK from the northwest on September 13, bringing cold winds and heavy rain, particularly affecting Scotland and Northern Ireland first. The Met Office warns of strong winds and rain from September 14-23, with temperatures struggling to climb above the mid-teens. Meanwhile, Phoenix, Arizona, is experiencing above-normal temperatures, hovering around 110°F for much of the week, with a slight cooling trend expected by the weekend.