Intermittent showers and an easterly wind flow will help keep temperatures down across Northland for the rest of this week.
However, the MetService forecast shows the mercury will start nudging towards the mid to late 20s from late Sunday when moisture from the tropics flows down over New Zealand.
Temperatures in Northland's main centres felt above 30C on Wednesday and MetService meteorologist James Millward said that was possible as not all areas were covered by official weather radars.
Whangārei officially recorded 26.23C, Kaitaia 26C and Kerikeri 25.5C that day whereas Kaitaia was the hottest place in the country at 11.30am yesterday with a temperature of 21.9C. Temperatures are gathered in louvered boxes at airports.
While the official temperature is recorded at Whangārei Airport, at Onerahi, the mercury will rise far higher inland. Whangārei city is often up to 4C warmer than the airport.