He expected it to spread across the country over the next few weeks.
Murray said while there were warm temperatures, some areas of the North Island would get "decent rain" this week.
"With a low, strong winds and decent rain, it's bringing in warmer air which holds more moisture.
"It looks like we could get heavy rain in the western area of the North Island," she said.
There would also be strong north-westerlies in the western areas of the North Island, moving to the eastern areas by the end of the week.
The Canterbury high country, Southern lakes and Central Otago may get a dusting of snow but it was "nothing extreme", Murray said.
Forecast:
Auckland:
• Today: Fine. Southwest breezes. 16C.
• Tomorrow: Occasional rain from afternoon. Westerly change. 15C.
Hamilton:
• Today: Fine. Light winds. 17C.
• Tomorrow: Rain at times. Northerlies changing westerly. 16C.
Wellington:
• Today: Patchy fog clearing to a sunny day with light winds. 14C.
• Tomorrow: A few showers develop afternoon. Southeasterlies. 12C.
Christchurch:
• Today: Mainly fine, but drizzle in the evening. Light winds. 14C.
• Tomorrow: Occasional rain or drizzle. Northeasterlies. 10C.
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