"Unstable southerlies" are expected to scatter a few heavy showers around.
It's the first time there's been more than 1mm of rain in 47 days.
But it'll only be a short burst, with "more dry next week".
It's building the work into its milk collection runs.
The rain will not break Northland's drought but it could flood Westland.
MetService says humid conditions are set to continue for much of the week.
Alex Braae explains what it all means.
It comes days after Cyclone Uesi wreaked havoc.
Prolonged rain is expected to last until at least Wednesday morning.