JUNE: Starts with fine weather. Rain mid-month but temperatures warm to very warm. Changeable later in month with fine conditions although some heavy rain to finish.
JULY: Starts unsettled with some rain, then dry through mid-month with warm to very warm temperatures, lots of sunshine and light breeze. Humid towards end of the month with thunderstorms and possible flash floods.
AUGUST: Thunderstorms quickly replaced by unbroken sunshine which may cause record temperatures. Warm mid-month but broken up by unsettled periods. Good weather towards month end before showery, cooler conditions move in.
This is not from the discredited met office who were wrong last year.
http://www.dailymail.co.uk/news/article-1259685/UK-hottest-summer-predicts-Positive-Weather-Solutions.html
http://www.positiveweathersolutions.co.uk/UK-Long-Range.php
So , this year, it really is worth buying a hammock and a bonfire and enjoying the garden :)