The extra sunshine will be appreciated by locals who have endured one of the gloomiest June months in recent times, with half the usual amount of sun.
The winds over the period to the end of next week are expected to remain westerly.
The US CPC says it expects the El Nino pattern to strengthen into the Christmas/New Year period, and predicts there is more than an 80 percent chance of it exceeding moderate strength.
Meanwhile, soil moisture levels remain at field capacity— saturated in other words.
However, the daily climate maps produced by the National Institute of Water and Atmospheric Research show the month is getting above-average sunshine, which coupled with the westerly winds, should help dry excess surface moisture.