Here is the CET for the summer so far. Looking like a reasonably warm year.
We only need an August CET of 16.8C to beat the summer of 2013 and that would give us the warmest summer since 2006. In fact it would be the 3rd warmest summer since 1997 (with only 2003 and 2006 warmer).
So not bad really although we could achieve this feat without any single month reaching 17C this year. To be fair we have had quite a few poor summers in recent years.