I knew it was going to be warm today but what was predicted seems a shade on the cool side. It is currently 27.8C in my admittedly sheltered suburban back garden but the heat seems well distributed within the vicinity here - five south-east stations on the Ogimet list were all in the Top 5

06/30/2013 at 12:00 UTC
1 London / Heathrow Airport (United Kingdom) 24.3 °C
2 Gravesend-Broadness (United Kingdom) 23.9 °C
3 London, St James Park (United Kingdom) 23.9 °C
4 Shoeburyness (United Kingdom) 23.6 °C
5 Northolt (United Kingdom) 23.5 °

Wanstead was 23.7C at noon