The first of Summer on the meteorological calendar is fairly settled around NZ, cool in the very south, warm in the very north – but the main energy comes in on Wednesday and Thursday as a low from the Tasman Sea rapidly forms and grows and crosses the country with a burst of wind and rain.

How much rain and where it falls continues to be fine tuned – and we’ll have more details in Tuesday’s update, but we take a look at the latest forecasts.

Later in the week warmer/hotter airflows return with high pressure also in the mix.

In the very south of the South Island the polar boundary comes and goes bringing some cooler days, especially to kick off this week.