As an occasional one off, an anomalously high temperature is nothing to be concerned about, unless of course it is a record breaking high, well beyond the natural expectation, as we saw last summer. Its not unusual for us to get out of season temperatures sometimes.
What is far more concerning is that these higher temperatures form part of a broader pattern that demonstrate that climate change is having a real impact. Month after month is seeing a higher than usual average temperature. This isn't good.