Recent weather patterns have seen much high pressure to our north keeping us dry and mostly sunny but, aside from June, protected from humid Spanish plumes.
A look at local east London stats shows that half of the last 10 July months have been warmer than average while only two have been much drier than average.
I’ve put together a few top 10s of stats for Wanstead, St James’s Park and Heathrow for the month of July.
Some national UK July values according to TORRO
Hottest: 19th 2006: 36.5C at Wisley, Surrey.
Coldest: 15th 1977: -2.5C at Lagganlia, Highland.
Wettest: 18th 1955: 279.4.8mm at Martinstown Dorset.
In terms of climatology July maxima, considering the 1981-2010 average, shows a fairly steady increase through the month, though around the 17th there is often a dip before a warm end. This would reflect the July heatwave singularity which occurs every year at 80 per cent probability.
The average rainfall graphic shows that downpour amounts are fairly random from year to year. The driest days are the 1st and the 25th. 
Wanstead Meteo 