Interesting one. I think the temps will peak early because 850s are on the decline from late morning, but it's notable even now how low the humidity is compared with 2003 or 2006. Heathrow is at 13C Dpt, which is certainly higher than yesterday but during the 03 heatwave dpts were generally around 16-18C on the hottest days. The 20th was a notable exception where Heathrow started around the current levels but then dived to 7C in the middle of the day.
Originally Posted by: TimS