Yep... i now agree with you and @kold weather .... as the anomalies/eps now retains high pressure across Southern areas through until the end of the Month, with a mean Westerly but high "uppers", the overnight mimima will be quite high, plus well above average daytime maxs.. its certainly going to be close.
Actually, ive just calculated the expected mean temps going off the current GFS max/min for the remaining days of June... i make it that going off current temperature predictions the last 12 days mean will be 18.6c.... if that is anything close, it means we will smash 1976's CET .. and possibly even 1846's 18.2c all time record!