A wet fortnight in June is quite common and, is often known as the June monsoon. It more typically arrives in the mid to later part of the month but has been known to occur earlier and even in to July.
It always follows a spell of settled benign weather in May, and is associated with the mainland Europe heating up and cold in the arctic still.
To be fair GFS ens have been consistently showing a warm up after around the 9th of June, and we do need the rain. 😊