Prepare to farewell the sunny skies that have graced many parts of the country this week as a rainy couple of days loom in the lead up to Anzac Day this long weekend.

The ridge of high pressure that brought with it warm temperatures and fine conditions will be replaced with a front making its way up from the South Island.

"The weather will start to deteriorate for the west and south of the South Island during the second half of Friday," MetService meteorologist Claire Flynn said.

"Rain will then spread northwards during Saturday, with some heavy falls in the west. Rain will reach the lower North Island later that night, however some places will see some showers before the front reaches them - particularly Wellington, Kapiti and Taranaki."

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The front is then expected to move over the North Island on Sunday.

After the front subsides a cool southwesterly flow is expected to bring sunshine to many for Anzac Day.

Northland, Gisborne and Hawkes Bay will not be so lucky, with a few showers remaining throughout the day.

The south and west of the South Island will also see showers, though these should gradually clear during the day apart from a few lingering about the south coast and Buller.