MetService Meteorologist Gerard Bellam said a broad trough of low pressure came in from the Tasman Sea, bringing with it various fronts.
“Canterbury down to Central Otago should expect maximum temperatures in the mid to high 20s with Ashburton expected to hit 27,” he said.
“That’s about five or six degrees average for this time of year.”
However, heavy rain returns to the West Coast of the South Island for the first weekend in December.
Orange rain warnings are currently in place from the ranges of Tasman northwest of Motueka, Buller, and Westland from Ōtira northwards to the ranges of Westland south of Ōtira.
The ranges of Westland south of Ōtira should expect between 170 to 220 mm of rain about the Glaciers, and 100 to 150 mm elsewhere, while the ranges of Tasman northwest of Motueka, Buller, and Westland from Ōtira northwards are forecast to see 100 to 140 mm of rain.
Meanwhile, in the North Island, heavy rain watches are scheduled for the Tararua Ranges and Mt Taranaki from this afternoon until late this evening.
But, the warm weather isn’t expected to last as a southerly change moving up the South Island later today.
“While we’re expecting maximums of 27 in Canterbury, Ashburton, and Christchurch on Sunday, it will only hit 13 degrees in those areas on Monday,” Bellam said.
“On Monday morning we will see that spread up the North Island.”