"But as the front comes in, that is set to drop during the week, with Wednesday and Thursday bringing some cold nights ahead."
He said the temperature would drop to about 14C-15C and there would be overnight lows of 4C.
"Hawke's Bay is set to have a few cold nights ahead."
That cooler weather won't hang around for long though, as a high front is to grace most of the country come Thursday evening, setting up a stellar weekend.
"The high front coming in will look to clear most of the showers towards the end of the week and set up another clear and fine weekend."
James said the changeable weather and temperatures were normal for spring.
"Spring is the most changeable time of year for weather in Aotearoa, what we are seeing is not unusual for the middle of September."
James said the rest of the country should expect changeable conditions this week, but with an improving trend.
"We've got a bumpy start to the week weather-wise and MetService has issued Severe Weather Watches and Warnings, so Kiwis should keep up to date with the latest forecasts."