A northwesterly airflow develops over the South Island on Wednesday then changing cooler southwest about the lower South Island in the afternoon, reaching the lower North Island overnight.

Some sun, mainly afternoon otherwise expect cloudy areas for the upper North Island. Chance of a morning shower. The Bay Of Plenty has longer sunny areas and mainly dry conditions. West to southwesterly winds.

Cloudy areas and occasional sun about the lower western North Island, risk of a light shower otherwise mainly dry. West to northwesterly winds freshen especially about the coast. Overnight winds tend light southerly with the risk of a shower. Sunny with light winds tending northerly or northwest along the east coast, afternoon easterlies for Hawkes Bay. Overnight winds change southerly with some cloud and the risk of a light shower.

High cloud for Wellington with freshening north to northwesterly winds, overnight expect a southerly change.

Mostly sunny with a touch of high cloud about Nelson and Marlborough, thickening in the evening. West to northwesterly winds change southerly overnight. Mostly sunny with increasing high cloud in Canterbury, northwesterly breezes becoming gusty for some inland areas. An evening southwest change (strong about the coast) brings showers.

The odd light shower or drizzle patch for the West Coast, some rain moves into South Westland by midday then further north late afternoon / evening. Easing back to showers later on as northwesterly winds change southwest. Conditions drying out overnight. Sunny areas and increasing high cloud about the lower South Island, freshening northwesterly winds becoming strong for some. A gusty southwest change mid to late afternoon brings showers then clearing later in the evening. Cold overnight especially inland with the risk of a frost by dawn on Thursday.