The El Nino weather system has passed its peak, but will continue until at least April, according to NIWA
The research institute's Seasonal Climate Outlook for the next three months shows rainfall and soil moisture is likely to be normal or below normal for the north and east of the North Island and along the South Island's east coast.
The country's west coast is expected to have normal rainfall and soil moisture.
Dr Brett Mullan said the east coasts of both islands were likely to have more westerly winds and the recent rain being enjoyed by drought-affected areas was unlikely to continue.
"The outlook is for continuing dry or most likely below normal rainfall for the next three months. There has been periods of rainfall which has eased the drought situation, so it's not as dry as it was at the beginning of the year, but we're nonetheless expecting it to be dry over the next three months."
Dr Mullan said the El Nino will pass later this year, and the opposite weather system - a La Nina - could appear.
"Going ahead into winter and spring later in the year, at the moment there's about a 50:50 split between the models as to whether they continue what we call neutral, so neither El Nino or La Nina, or they go into the opposite phase to El Nino which we call La Nina, where we tend to get more northerly and north easterly winds and so often wet in the east of north east."