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Temperatures tickling 20 degrees are rare for this time of year.

There's a reason Wellingtonians might've been sweating overnight, MetService says.

The forecaster said the first official days of winter have seen record-breaking highs with temperatures peaking around 20 degrees Celcius.

Meterologist Lewis Ferris said Monday and Tuesday reached 19.9 and 19.8 degrees, smashing June's 55-year-old maximum temperature record by more than 1.5 degrees.