Where is the Summer Heat?

Yesterday (Thursday) was the warmest day of the 'Summer' so far. Here in Morden, the temperature reached 27.6 Celsius, central London and and Northolt reached 27.5 Celsius, and Heathrow Airport managed 28.2 Celsius. Today is less warm, but humid, and over the next few days it looks like being warm but probably not hot. In the London area there is usually at least one day in the Summer when 28 Celsius is comfortably exceeded, and, of course, there is still plenty of time for high temperatures. In recent years, some record-breaking maxima have occurred during August. However, if the 27.6 Celsius should prove to be the highest maximum, it would then be the lowest yearly maximum since 1978!