The Met Office has provisionally recorded the UK's first-ever above-40°C (104°F) temperature:
Heathrow's 12:50 BST report to ICAO put the temperature at 39°C, with a heat index of 37.1°C (98.9°F). Meanwhile, the city of Abadan, Iran, has hit 51°C (123.8°F), which I can scarcely imagine.
And yet, the forecast for my trip this week looks perfect: highs in the mid-20s, with possible sprinkles Friday morning.