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September's climate

New Zealand climate in September

Rainfall (click to enlarge).

Temperature (click to enlarge).

September was a relatively benign month with more anticyclones and less wind than normal, and less extremes. Rainfall was lower than normal in many areas, especially in the west of the NorthIsland. Temperatures were above average in many North Island areas. The national average temperature of 10.5 ºC was 0.1 °C above the historical normal.

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Soil moisture deficit

Soil moisture (click to enlarge).

Soils were drier than normal in eastern Marlborough and north Canterbury.

River flows

River flows (click to enlarge).

Stream flows were below normal in east coast regions, normal to above normal elsewhere in the North Island and near normal else where in the South Island.

July to September: the climate we predicted and what happened

(click to enlarge).


Predicted: Normal or above normal rainfall in the north and east of the North Island; normal elsewhere.

Outcome: Above normal in Northland and parts of Hawke’s Bay. Below normal in the northern half of the South Island. Normal in many other areas.

(click to enlarge).

Air temperature

Predicted: Above average in the North Island and north of the South Island; average or above average in the west of the South Island, and average in Canterbury and East Otago.

Outcome: Average over the South Island, and mostly above average over the North Island.

(click to enlarge).

River flows

Predicted: Normal in most of the country, except for normal or below normal in the east of the South Island apart from Marlborough.

Outcome: Stream flows were below normal in Nelson-Marlborough and the South Island east coast, and mainly normal elsewhere.


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