Eastern areas like Hawkes Bay are in prime position for spring-like temperatures and long dry spells, with Weatherwatch head analyst Philip Duncan predicting some areas would break 20C today.
Rain will ease during the day for the upper North Island, while the north would start out cloudy in the west before sun breaks through. The east coast would be mainly dry with sunny spells, WeatherWatch said.
Another northerly rain band is expected to move onto the South Island late tomorrowand will affect the whole country by Wednesday morning.
MetService is forecasting rain tomorrow for the western and central regions, and heavy falls in some parts of the South Island including Fiordland and southern Westland.
Strong to gale-force winds are also expected in some areas.
"Our expert meteorologists will be looking closely at issuing severe weather warnings and watches as the next system approaches as it looks like it may have more intensity to it than the weekend's rain," Hines said.
MONDAY'S WEATHER
WHANGAREI Occasional rain, clearing afternoon.
High 18C, Overnight 11C
AUCKLAND Occasional rain, easing at night.
High 17C, Overnight 11C
HAMILTON Rain, clearing morning.
High 18C, Overnight 12C
TAURANGA Rain, easing to afternoon showers.
High 17C, Overnight 11C
NAPIER Showers, clearing.
High 19C, Overnight 4C
WELLINGTON Long fine spells, northerlies.
High 14C, Overnight 10C