"That means there might be a light ground frost."
Best said the high pressure system would be "here for a while" over Whanganui.
"Saturday will be fine, with light winds. The temperature stays around 16C.
"Overnight you'll get down to 4C.
It would remain fine on Sunday as well, Best said.
"There's lots of sunshine, with northwesterlies developing. It'll be a little warmer - 17C.
"The overnight temperature will be 6C."
Best said that pattern would remain for Monday, Tuesday, and Wednesday.
"They will be exactly the same as Sunday. Sunny, with temperatures around 17C.
"The overnight temperatures will be around 6C, all the way through to Wednesday.
"People can get up early and have a wander around with the dog. Just be advised it will be a bit of a cold start to Saturday morning.
"You'll need the fire on tonight [Friday] I think."