"I'm sure the rain will be welcomed by gardeners but there won't be a lot of it," Little said.
"There will be a few showers with cloudy periods in between."
About 14mm of rainfall is expected throughout the day.
Temperatures will begin to dip on Tuesday as southerly winds move in and Little said they will be strong for a time. A high of 18C is forecast followed by an overnight low of 6C.
"The southerlies will continue on Wednesday and the high temperature will be 16C which is more usual for this time of year."
Little said a series of high-pressure systems had led to a dry, warm autumn.
"Here we are in the last month of the season and the central North Island region has stayed very mild throughout," Little said.
"You will see a drop in temperatures midweek but it is due to warm up again before next weekend when it will turn northerly again."